Malicious PDF — malware analysis report

Static analysis result for SHA-256 7893c1899c678c5f…

MALICIOUS

PDF

87.5 KB Created: 2021-06-28 08:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 94cdee4d76fd587fd0081a3934e68916 SHA-1: 093cf403bb2830a4ab238621432a4d15f89d472a SHA-256: 7893c1899c678c5f1d1ad75f68f4be1dad29f8aaa18238a10cb19477fb04c8e7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The document body is heavily obfuscated, but the presence of numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggests it is part of a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crewmak.ru/uplcv?utm_term=over+the+counter+meaning PDF link annotation
    • http://innotec-industrie.be/userfiles/file/kafebutuxomenebejilelo.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/48056026687.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/42859123678.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/e2k3bsf7t5ic4k8o02got526p4/1524606333.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b519d1a5db3---labebovirotexenawagusukan.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cl72qbcbtui3dra00ujopecge4/viwezetefobalolasegunitir.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607892791ba95---pogesawig.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/5loioal635i5g4tvd1birlrgn6/julupobawefivelunenu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb14e3c33---dezabarupujowude.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/2665467693.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4af6bb5b05---zoxafej.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/52251946127.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/603c1a253115793ff0b782cdc1682229/talofatole.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa637286436---77286683603.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081088f0d8e2---voxufaguviweribelanavoziw.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d437a3da837---sedaxurifi.pdfIn PDF document text
    • http://firegallery.ru/img/upload/zujuvuxigewiputut.pdfIn PDF document text
    • https://tsegypt.com/file/79760064884.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e7fa90be0520d5362bbb06f75b066b22/92732919041.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3f7aee503---81797843323.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/44775112119.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/bcc9baf364b9734bb58572cebcfb13bb/wanifepegax.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_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 19744 bytes
SHA-256: 96c71b6cd9dd52fd47a83ce75ad129c06d5965a52c488769e8ad6cee6f984e75
font_02_sfnt_off0001387b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387B 10656 bytes
SHA-256: cdde915f7fd7df0ab63935ceded2290e723d7ea7749c9e25cc2dc54caae104d8

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