Malicious PDF — malware analysis report

Static analysis result for SHA-256 628df4118ee3036c…

MALICIOUS

PDF

85.9 KB Created: 2021-07-08 12:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49c7e36e344cf8b4eab55bda4d83e1ec SHA-1: febbc04b9fadd28bd72cf3cbc0550f27b73e6d6c SHA-256: 628df4118ee3036c27395d04a7270c741a23c8ae13ab3f84bb565825eafb7007
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of a callback lure suggests a phishing or tech-support scam pretext to engage the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c02426a236---79857504119.pdf
    • http://www.tobywells.org/media/fckdir/file/32013976981.pdf
    • http://fapannimario.it/userfiles/files/tazigev.pdf
    • http://lumieretvie.com/userfiles/file/66959847376.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/610931a1c788993560427e9489e8b86a/43137230963.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad000b6276d---zuxizavarefodupi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb6b3a9d0---38434171714.pdf
    • https://blindnow.com/userfiles/file/difetudegubokaxa.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lfujuu9r4u9d2thbkcffnnjra1/xiwerivofuve.pdf
    • http://daoltrading.com/userData/board/file/81069820705.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae75055f03e---pakupakuzile.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0e2129545---95662783618.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd5034eb39---gesuzetimogazuvami.pdf
    • http://au-coeur-du-temps.com/userfiles/file/norinutowejifis.pdf
    • http://capital96.com/userfiles/file/6620011199.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/0jle0k7qtf4p36cqem07mhofbb/fesamigeganatikonuram.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4a2b40c2b97c61a998509a961a81c965/27672675351.pdf
    • http://jshtextile.com/UserFiles/file///61802822047.pdf
    • http://seabeachthailand.com/UserFiles/file/mufimunipudumutakug.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/dngvr07ocr086t7882lmogj0j1/varofenojolizeme.pdf
    • http://wildpflanzen-planung.de/file/94500347231.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c090f42ccdf---50318617813.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ccb17e794---47679703733.pdf
    • https://angelsstaff.com/uploads/file/lasofowevizomeki.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=history+of+internet+banking+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec86.bin
ba1d1c53957d4db8058533003370fe685e8f6235d7cd0e184b4c6083a7d7723c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 16584 bytes
font_01_sfnt_off00011784.bin
fb17495eb3054f373909dbd01cdcb3c85a51c37c167f7a59c1667a60f277083e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 10964 bytes
font_02_sfnt_off000130b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130B8 16792 bytes