Malicious PDF — malware analysis report

Static analysis result for SHA-256 946d78d1e3d49268…

MALICIOUS

PDF

81.5 KB Created: 2021-07-27 21:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15d0c37daaf6bdcd7ebae182871d40b4 SHA-1: 69cbade632127a015aae0753635e8f3be019906f SHA-256: 946d78d1e3d49268462a5510124f256678887003e97417d4d3e23b8f58f12ea9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous links to potentially compromised WordPress upload directories and disposable hosting, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to deceive users into contacting threat actors under the guise of support or billing issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://avsa.org/sites/default/files/images/files/98700005450.pdf In PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f64ac779b17---vomasasabired.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee15bba8eb---lejofeludegidud.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f35a37f30d---kezajipazegam.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/dd0612d25df59d1e513965ef07fcfa7c/32388370131.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5129c1804---wixowitapoboke.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607823c5dde9a---16363395208.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d23df07b47---45393274772.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/33035567797.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/37391606692.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/1905e9f29e2eb488f98a0614433c2a88/45794343985.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/88641801420.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/26717221367.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/61b6a637036784d89c8f3cdad99f98f0/70925981747.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/47965306765.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3d57fd044ca322f256c35c610de98d7b/97508293532.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/47185510005.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/pinipub.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/linomewinexemo.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8d387d6cd60d2406f759096d98764fcb/6778508611.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/sgfakbm6qu3g2im4gfs1n3otei/53230419710.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/47215842677.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2c49cf3b0fb822cc3a42497d7b42e9e6/podutel.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/zupiso.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/ef1a02c14556ddbec5b182e337d862b0/gorades.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=big+ideas+math+6th+grade+chapter+4+test+answersPDF 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_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 17380 bytes
SHA-256: 9226589b790afb5d0224d8d01b6d4e49d706cc90654031105d4379c616c5b31e
font_02_sfnt_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 11180 bytes
SHA-256: bf85453bbe049622e56d8a8239fe37f85b2e090dc97ed3a79ae0282aa23779c5

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