Malicious PDF — malware analysis report

Static analysis result for SHA-256 5173862a13762683…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 02:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b7ecb94a06fe24734cf492f7a59fcd0 SHA-1: 8eab8869b4cf6ac1cea8c5a7f034a86d94e9ea7a SHA-256: 5173862a13762683c33a7326cd9e639d09006921a8ef6c2e32d6a4a0e222f875
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick the user into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were extracted, the presence of numerous links to potentially compromised or disposable hosting sites suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://fritz-fahrlaender.ch/download/60716380617.pdf
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/mikufilorowu.pdf
    • https://nistd.in/userfiles/file/paliro.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/3btmhqjd1reht81gk32j14r6nn/ruvotimer.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d99696217---bolumezeki.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdef8b2ae5---77679425290.pdf
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/67611975455.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/xafofamexolofizalozezuf.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c3b3393c3---3470639893.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b2eb645269cfeff82b6d163c0a197aeb/vizuga.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/af6dcd46b1effc41529ba979b1797726/38522466346.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24e0351934---nizesapujokoma.pdf
    • http://baldonimarcostudio.eu/userfiles/files/87913424622.pdf
    • http://www.wiz-fac.com/uploadImg/file/65594423038.pdf
    • http://samurairamenbar.com/uploads/files/zowewotojesilipi.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072867307207---61686954344.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a6b36c909b635f5e76c6760e60c15105/16204304308.pdf
    • http://greenbiotech.vn/uploads/userfiles/file/32365390360.pdf
    • https://doctornhospital.com/banglanews24/editorsfiles/files/gexikinawog.pdf
    • https://jordan.si/dokumenti/file/64518916511.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4050a1c396---58490473171.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/6c6c802ae2972ff8c2ff609905578033/pewuzadoj.pdf
    • http://at2apigroup3.com/contents//files/gabafa.pdf
    • https://limpiezasinasel.com/userfiles/files/70737234322.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+playground+safety+worksheets
    • 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_off0000d6d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 16792 bytes
font_01_sfnt_off0000eee6.bin
5db934de2148441420b9ecd995ec3824785f3bdd0105912561d3012d78772017
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 17148 bytes
font_02_sfnt_off00011b37.bin
93017b59b7fdf4d2e2363daafd8c89fa07d1f5e66c247f06e84febf1df24a301
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B37 11056 bytes