Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef57e981b3785016…

MALICIOUS

PDF

88.7 KB Created: 2021-07-02 00:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 89993d16f4d1aa90d4c15dfb39b144d5 SHA-1: be8a16b74d1314908df4d3ed96691a1713ed8d77 SHA-256: ef57e981b378501623f48ccce8abe084450c9ab6e72be818f30b25f4d9d8fc9e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document's structure suggests it is a link farm, with many URLs pointing to compromised WordPress sites. The 'SE_CALLBACK_LURE' heuristic indicates the document attempts to trick the user into calling a phone number, a common tactic in phishing and tech-support scams. No scripts were extracted, but the overall pattern suggests a phishing attempt designed to elicit a phone call for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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) or Microsoft license-boilerplate 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://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a595c60e---meduxigikewura.pdf In PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64c423f2aa---wuzigabu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bac9fdb5242---28959506350.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/dejiwedoka.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/16989201293.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1600c97b8805efdbfa312dbab93d2752/26792545868.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7015c4cf6419ffe4e65faf17f7582af8/70019668006.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/cdd858532dcfa32359d99664244dab61/87453794672.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/13421363659.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/vizugevonipawi.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/83df486beb28e521af5779b6042fd22a/fukubekelutidizenu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/qecpodj0up6q26uhacu3akf88o/66667161090.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99f616b8b---lilatotifoxupalisebeni.pdfIn PDF document text
    • http://htwy.com/upload/file/mikegiserijanejam.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/15206581079.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/6539f81628ced71c893ed8e0d9a158ed/zizixamirawegenovimejusip.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4edb7ae904---77046707270.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8ec77216c---fidogibirewamuwazusapu.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/13049613286.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa130989c---gofudu.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/kukimemorumesezepo.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/57843958208.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/fopip.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078acc693d5e---pefutosurekuf.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/qhg97thn77fm034k6o987e2dg3/fovogel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=signs+that+staph+is+in+bloodstreamPDF 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_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 11056 bytes
SHA-256: ae4293fb1e33e12b8689e70572880f06cbf2477f6673c86b317659b6842ca383
font_01_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 17420 bytes
SHA-256: 66c458422caa37d316693e82612dee2983bdd5738fb2ac9a3a6260b983871dd7
font_02_sfnt_off00013d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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