Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9783894b6e8d298…

MALICIOUS

PDF

92.8 KB Created: 2021-08-11 00:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 95f51cb45b961d4d41912a165fbae769 SHA-1: 16f834fd9823806270ceea827ebd1d3566659ead SHA-256: c9783894b6e8d298c85eeda41801fe2495d0236d9beb45fea96db91cf838527b
176 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the presence of numerous links to compromised CMS upload storage and disposable hosting suggests a malicious link farm designed to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b8e6a0d3---dewixenamijutukotisutulu.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de88f6e3c94---66165629653.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/fifiwekejoz.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kulex.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc0787186---64025814568.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/6779537311.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021080715342421.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/21196411225.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a1d25daa98be21cc7fdd33ed450fb7ca/20242545489.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6319b8db21---pezejofovujofujikumon.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/luvimosilunorenelesil.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba27eba71f---botuxonup.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fd81245a92f29988ee3f27ec39d5c55d/45479113316.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/tgv5r20peai55f31qs5rl0bikh/givarosu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dfhfcg6f950efk964256gj29u7/kizolis.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/18940952091.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767c429cc4d---8927572135.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/22190760926.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/88480812452.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160706f5554699---23769012463.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ebd1db50c2ce8cdb6cc04cd32aa99a60/vawazufizefi.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/watavaminawoxi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e2fb8aff7---webisasijofimevigitepimi.pdfIn PDF document text
    • http://allycatering.com/userfiles/ripimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+pair+my+jib+wireless+headphonesPDF link annotation
    • 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_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 11020 bytes
SHA-256: 692f0c32f99fecb5c22a784e6b164917f60d51adf2ba8860bf86ab8aa73e0ed5
font_01_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001344c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344C 18208 bytes
SHA-256: 3ecefc2dca875232fcedae40b8a4b85d844d77593b8ee5b676a1f9e534dbfdf5

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