Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cf124ad9a24b95…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 05:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 479d5aaa1ff4fb94fdaffe7c4b589c65 SHA-1: 63a4d7d205a3c093dde3625a49ad32dd188ec6e1 SHA-256: 71cf124ad9a24b9578fff5b200d93d4f8a6c0f2d391a82764df1fa500c9c7ffb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://dongshengcable.com/images/upload/File/82908757947.pdf In PDF document text
    • https://hsdinstruments.nl/uploads/files/lewunufalufo.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/3703779031.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16117e47294f22---nafuxuvitegifow.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607018cf8add6---80290858602.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/bowapixi.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/xoneveg.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de3357035f---wutunulizelejisaxe.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2546c6fa875bd39f52a342c49fc96134/81044465191.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/rojuwawuxelekunigebopeduf.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lu7tmccqojtsfaqkbekadvd5un/42308294498.pdfIn PDF document text
    • http://centronegozi.com/public/34376167142.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/jujoz.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/32795774795.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/96737661599.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d576fc87db---7274041710.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/titonevilubunosex.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/40450729369.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-15/20210515012959106497.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/nejekagigugitapi.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/48641877005.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/jojiti.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/7930997525.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/zotokikujonewijebukuja.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085838e5bbf1---nopapivelusosuxasudakaw.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cae8d8ce5---84861363643.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16116e5633a98c---pojejeresux.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/mawotakebogixodef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=il+love+pdf+unlockPDF 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_off0000d2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AD 10204 bytes
SHA-256: 616a285fb80636e0f44b7dae3b181721d678fb7888b275eb28762af854925a22
font_01_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 18424 bytes
SHA-256: db116a9576994d21b459801e16981ffaeb5f680ffe683cabf8b53b2b560d5e35
font_02_sfnt_off0001199e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1