Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a798fe96e24882…

MALICIOUS

PDF

85.3 KB Created: 2021-07-15 12:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c38f48f4dcc597f32e1c4c763724ad40 SHA-1: b5c2bdb80a48b543d9844fd664f5465420f6804b SHA-256: 75a798fe96e248822be1c431e9801f0b175b01f882e0adf5cb78f1ca346ffd22
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or scam attempt, specifically a callback lure. The document's structure and embedded URLs suggest it is part of a link farm hosted on compromised websites, likely intended to redirect users to malicious content or phishing pages. While no scripts were directly extracted, the presence of multiple PDF-related heuristics, including a ML classifier flagging it as malicious and ClamAV detection, strongly indicates malicious intent. The primary attack pattern observed is the callback lure, aiming to deceive users into initiating contact with threat actors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://passaicvalleyclassof1957.com/clients/44362/File/26436231674.pdf In PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073a38e46e1b---56967701556.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160763bf5ad8d8---nazategobo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9460e8e80---wireguvejujibupa.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/1358q9bt5hceg4h6bpiba8pvn6/44068795637.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sdups10vhdh06a9k3h730kt090/40142934434.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/1465140658.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6a6d20521---46775164101.pdfIn PDF document text
    • https://oversaslogistica.it/file/21464043343.pdfIn PDF document text
    • http://walkandsmile.com/userfiles/file/wesatozivaremitivojane.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9061f17c2---149121368.pdfIn PDF document text
    • http://vo23.ru/upload/file/kinorenagepudakid.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea67c99ac---30605306356.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/73659613644.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb458e6fe8---90084821548.pdfIn PDF document text
    • http://unsersohn.ch/images/file/gufonuka.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210609044956.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/54403719430.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/67417508333.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/86dc7148073dd0f1b7dc4b4e0c42d21f/fitejomiwelixis.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609431ba5da26---85543124443.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd91fbefb2---sulogakoferiwoduni.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/60371eb4e14729e7e183176c2535d92d/5859724604.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/66464041538.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dca621e7a4---24675058277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=did+we+go+back+an+hourPDF 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_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 16712 bytes
SHA-256: 6aa1c5bd3d05f98641b6446cb98c9cf98873e8bf42a044ea2543ad592fcf38f8
font_01_sfnt_off00011765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11765 10756 bytes
SHA-256: 2589a362e309709339feb1c427feef16e84e2614ccf6afd4011ed961871f6eab
font_02_sfnt_off00012fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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