Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32c215d7535abb8…

MALICIOUS

PDF

116.1 KB Created: 2021-08-22 02:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7bb27117b5813eb4833ef3edc232be47 SHA-1: 01f53a3b1d86853466620150172a911b1f4843b5 SHA-256: d32c215d7535abb8be402fd926f4f8bbecefcc506afe6316905d770a16933aca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting it functions as a link farm or redirector. The 'SE_CALLBACK_LURE' heuristic confirms the document's intent to trick users into calling a phone number under the guise of a support or billing issue, a common tactic in callback phishing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://synerhu.ru/uplcv?utm_term=no+sugar+no+flour+diet+reviews PDF link annotation
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091f710e4925---97851556891.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/447q9lmcbropvae9g6vh7udvkg/fuwogimuwigixato.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nhfptmrba91e8bep4gdtnuv161/fobobup.pdfIn PDF document text
    • https://songhong.info/userfiles/file/83785080103.pdfIn PDF document text
    • http://cmtsport.com/pliki/86761702380.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/xazorob.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/94432428785.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/25730223225.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07920866b8---mumurize.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/gerovosaxobixebiri.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/63516924001.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/kozomanejemofudor.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb418beed6f---nirigiza.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/19847227234.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/fb832hrvb4plc5tgum7spmdld3/pufabakelusufavisubunawi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8e2b67113559ab9af0c6a8d4b054dc79/82854550726.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/komugawimerelamulikoxopez.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/balovajadinifokawoto.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/l2b4a44anrthqog1d982o2togu/sidolifuxibigaj.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/tofafube.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/352dc3a536c1305a32546ea2c13140b8/wuvujevirixibogebi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e517c0a7293---29536851711.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/je758oruv56ialj2frafammg9g/gagivisunobejur.pdfIn PDF document text
    • http://ezibra.pl/upload/file/42272537957.pdfIn PDF document text
    • 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_off000162d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE3 17612 bytes
SHA-256: 342fb5c4b3d4dad450eb0fcc08c3241493227c6120d7e3cf9d58621f5977621f
font_02_sfnt_off0001a8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8DB 10760 bytes
SHA-256: dc2ffd5a2eba0ea00021e3fd38714f874f01a118c520ae6e165fc0cb62f508ba

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