Malicious PDF — malware analysis report

Static analysis result for SHA-256 575945f0935253a6…

MALICIOUS

PDF

90.1 KB Created: 2021-07-24 18:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5e1ba57a55c898952c80b7d1869702b0 SHA-1: 9140aeac4e3ff515d73e328b2a7b992e8c6988ff SHA-256: 575945f0935253a69c866adad49d416f925f3977827fe9ffc22d80b5eb8a2726
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://augsburger-dartliga.de/uploads/file/zasudejifiravamokuzuteg.pdf In PDF document text
    • http://sys-svinding.dk/userfiles/file/tuzapaduniwizatupurijegaz.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/lirumurewawo.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/80332225004.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17ee1641b---53960798719.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/kagagakisajakatode.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/sowuv.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/sidobirilobemak.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a3ee72147a2cd2d6f2df4e459d8d7585/mebivamo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608980c3732a3---70585552819.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/lizuj.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/fddbd6951fcbc8d26ee237e9f92fa8cd/28415855704.pdfIn PDF document text
    • https://p1gtac.com/uploader/files/2413419536.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c4f1c770be677218fee5f532c2f2f0e8/fabosex.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e0f3b598e---xeriwusiteforawip.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/somon.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jomurowipijaguxo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b18620485---61913904246.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/89fe7ca1dd5d91d772df0ce5c447f570/pujinijewig.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fep95218homc42ug7ph3rscv29/47019147714.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5033e843dc---mafobutimaviwigotuz.pdfIn PDF document text
    • https://olterus.com/contents//files/zegivapuxujisazijep.pdfIn PDF document text
    • https://edarky.net/data/file/xewukuxatefeketeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+sensitivity+settings+for+pubg+mobile+emulator+2020PDF 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_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 11416 bytes
SHA-256: a865d98a605191e0f637287ccf22d08c9713daa5f9197a20fd6a840dc9cd6737
font_02_sfnt_off00012c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2D 17616 bytes
SHA-256: e7d43e8a742b2c18545c25aad9261e6d3f6de2f0a0ba080a502cf4684d4a38f9

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