Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97241fb1b6cfc75…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 00:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d100951b87957016b977dbef2b9f6ab SHA-1: 3f982bb37add60ad64d6f0443fdb09c3db16c0d8 SHA-256: e97241fb1b6cfc75dc4af18d2fb7119efe6adff43b3cc0177fcf1cd1485e7c4b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://garglob.ru/uplcv?utm_term=root+tool+apk PDF link annotation
    • http://utcsp2.rustyramone.com/uploads/files/36578120299.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/tuzepajanos.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/51021371170.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/79040642018.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/zoxurivonopilenikimebuk.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/14c6d9b480378028cee880b49d155276/75464389572.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210926052109090.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/piguraxas.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/75483296085.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/1265053942.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/3994943631.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a065378881cca2a1bd795af12ce891f8/finiseditas.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/88696280995.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/tavezesojolekefozogipagaw.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/nutasowinudedamibipujes.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210908035638_91ggfk.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/43838412343.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/17ec7d0e98cd1aad3e3e692850ca0426/5334652140.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/mewifixiwiruzezose.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/75249941577.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/xifewuwewukotapiwepagu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/94339160992.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/16838982371.pdfIn PDF document text
    • https://festacontinua.it/public/file/36259386307.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/jijanutilorubuj.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_off0000b0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC905 15748 bytes
SHA-256: 123a6da736d822676321e965ae088df09b9331274cbfa211f516a3c06caf5d51
font_02_sfnt_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 9784 bytes
SHA-256: 91a87b1381ce105328b2bb17b06c73b82f9eeaf14572da2d7894084f470875aa