Malicious PDF — malware analysis report

Static analysis result for SHA-256 79db35e8ee5a4a14…

MALICIOUS

PDF

88.2 KB Created: 2021-08-13 07:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ca5ea571510957ad0e0da6e681d54e7 SHA-1: cbab88f897b823af1e69ad3faf48c14a6ecca879 SHA-256: 79db35e8ee5a4a14078a4508ba46707f525afa44271d632ed938e6002e89efa4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or tech-support scam context. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=superstar+starship+mod+apk PDF link annotation
    • https://audreyheselmans.com/_files/file/vizinuzetisosixajew.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/kukowixe.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/40902909935.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/xuxikotapowen.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/lovezamikun.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/jabojabaruj.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/36902051600.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1cbe69a2ae2fb8c5688d09b6bdf84f44/kujosor.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/93116605556.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/fivuxisijebu.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/mebopajajarijutebufefa.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/56141412340.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d2f0d605---dazizuzemizavaxel.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/2e30061475ff4734295a2dbc3717dfa6/90092470235.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160806a2c18639---refenuxinilitezugowuj.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/da81556b4741514786035f5729280277/xarorubawonajojisokekaxi.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/nibige.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/lalaf.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/93013475873.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db24ba250d5---muxalidefet.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/42932486288.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 10776 bytes
SHA-256: e3cb3ce41b0c88cbc9a2f6d05dc83f7c9d57ffbef090d465900634dae8d3b871
font_01_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_02_sfnt_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 20396 bytes
SHA-256: 5754a33d28ef53c34efeca997b91bf631d4a99d8cdb3e51bf40fac04b923811b

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