Malicious PDF — malware analysis report

Static analysis result for SHA-256 a646fac2f9eb59f9…

MALICIOUS

PDF

74.1 KB Created: 2021-06-28 14:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c65c92975360e81c8195b3fdc5d8713e SHA-1: 8c88316e723142dbcc5192acc051e04f036de57a SHA-256: a646fac2f9eb59f91e4cc05695c8d004044dc0fae9f5a289361a1cec000af5dd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection further support its malicious nature, likely exploiting PDF vulnerabilities to execute further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=confused+again+novel+read+online PDF link annotation
    • https://shop-ecobati.com/medias/upload/files/xugabasunitudol.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc9c08d9c7---93774445701.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098928f96129---buxuxona.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/vukegel.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81ef90ae2---16701971634.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/a8ef453be6666ad7abbffe3fb1d2ae9f/46692915843.pdfIn PDF document text
    • https://maturana.cl/upload/file/vukumunesidokufuka.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/rlckc6he8fqdoecj07ccuuakei/gemunojaralimakutodobinop.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/n3rvshu9so23rahqu6meec4vv2/nulufowifabam.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/bajimawiwarolezixufukig.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4fd1ab009---95259864120.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16081a36b3da2e---44517443822.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/babc72817fb59fcbc555c44e831b4b84/66351209750.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5a06dc511---68439952545.pdfIn PDF document text
    • https://t2sc.me/userfiles/59496612015.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/sozawedabi.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6afcb0fb8---senurupepafozi.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/28543838695.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/92e8da5d318c54cca2051f8064c6ad6b/37944689187.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a26b95b7983c16762f97e2cbafdc4783/22198762322.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b0a2affaa64ee6aecc2ff09191babd74/benorugebimebaref.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/zobezovidelo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dd6246eee---dukefigijeka.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608662053bf3b---33452061533.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d0d4e517---nikemuwopuzis.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160775902c86c4---tikebiwanomijuxo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC246 10628 bytes
SHA-256: 01925baa3ebf291d3a3a0420814284b0e0433ec4c99d345a2364af2437476754
font_01_sfnt_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 15740 bytes
SHA-256: f1fbf6e1dd603230b44ce85fb84e16c9c1b2dbf52dde920d667656c01e499ba1
font_02_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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