Malicious PDF — malware analysis report

Static analysis result for SHA-256 9543d88f724abb86…

MALICIOUS

PDF

107.8 KB Created: 2021-07-03 03:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f2a7ece0243624a01b9af6d93f3d295 SHA-1: 0f4e90692b1ddb40468820b3d00a01bb48e8c0db SHA-256: 9543d88f724abb861777dee9a3c8556f8fc2de2f51f6383cfa48486dd8167df6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. Heuristics indicate the document is a link farm pointing to compromised WordPress uploads and other disposable hosting, likely intended to host malicious content. The 'SE_CALLBACK_LURE' heuristic suggests 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://swagath.co/new/ckfinder/userfiles/files/vewevavo.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840d4fa84ca---98284501137.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/49662280385.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33896a29c---sobiguzurevoxaj.pdf
    • https://bisnismedsos.com/userfiles/file/gizalepixiwujitun.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd901840da4---fubodanujexadidewogu.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1991e78a84---57793957475.pdf
    • http://studioindelicato.com/userfiles/files/63227801243.pdf
    • http://nowyhotelik.pl/userfiles/file/97600611002.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf2de94af3---94678792465.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d24949df863---ribop.pdf
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/p2lft22tgd3mpc65ntv7atkp9f/nugosuwesexanewefiv.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160daf084bab0b---24369038574.pdf
    • http://ubest.ru/images/file/pinewilisokujutepa.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e9768a6c---momaxew.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091adb26ec00---pifute.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609007cd0ced3---37731889554.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/lf1j30icvdi6vstpfq1dgtkofa/xorazuduxam.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092b64bcf951---30734118724.pdf
    • http://cesnek-vysocina.cz/UserFiles/File/10175498744.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/bd43d851bde6f6a7aeed8781543017b2/81748308284.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4279939545---suwawekopuni.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6b7916a46---guzodar.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=words+that+will+make+you+sound+smart
    • 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_off000144c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144C0 16792 bytes
font_01_sfnt_off00015cd7.bin
99b42a76500a241f5471edec60ab1f0c9a2becf35a1410b18217fb7e59e215d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD7 10896 bytes
font_02_sfnt_off000175e5.bin
22ec4e544a192cc7f9efff1aaf95bedd47ae00d0dd498ded0c7b31b9cda80b82
pdf-font-stream PDF embedded font (sfnt) at offset 0x175E5 17068 bytes