Malicious PDF — malware analysis report

Static analysis result for SHA-256 4add7064427acbb2…

MALICIOUS

PDF

88.0 KB Created: 2021-07-18 21:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1ec2171001f23d0dc1b09bbe282e4bd SHA-1: 595211db0483fdeb03b495d5eb632ea02f149632 SHA-256: 4add7064427acbb28dcb5951464baf3f0df1b11e589519bfff8a84b88fe9cc23
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external content, likely for phishing or to download further malicious payloads. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ash-graphy.com/userfiles/file/koposobituwu.pdf In PDF document text
    • http://heorungminhphat.com/luutru/files/3341191725.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/14320023477.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/dokimusegijevibojovivo.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/fc56cc54d5247e1856fc3be9a8da1363/sexotipe.pdfIn PDF document text
    • http://airsoft1.ro/files/file/rofuvuwixisogugikuwawig.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/a1352g6ahr963q8jubpjrd70si/vedubunupiboz.pdfIn PDF document text
    • http://zimmerei-possert.at/30935755357.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/21822015183.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d9c102248cea63155825e1d9e5db41a/vusaviweji.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b8bd829737abdc793d00b9310fe7b0a8/ximuvuvagapesoxopexasuzen.pdfIn PDF document text
    • https://termocasasrl.com/file/85794720903.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c7f950cj1h4t355nnsd9q6vns1/wezowitafujetadozebotakuv.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5b1289ab8bdf299137757a51a321d935/dunuxeke.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/womadavemov.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/eth7em0t1unikdcrunlle7nv76/subop.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/76433184802.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/xisukikagum.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16096da99db5fc---ruxawo.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/00hbh8s0mfhmnemc38t85efae6/zowudoduwonudowirel.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/javofobutaxebirokag.pdfIn PDF document text
    • http://ortetel.de/kunden/schurig/ckfinder/userfiles/files/89828390143.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/kejaleja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=icd+code+for+hypokalemiaPDF 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_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 10672 bytes
SHA-256: 0793fc56a97824b3b2ba443238793347130e0480ec3f53f1f233bfaae2e950e0
font_01_sfnt_off00010e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 17072 bytes
SHA-256: 237a1c535e1c8a581e1be609f7bc157e02d5535f7f76708838cb6f68a1d36dd4
font_02_sfnt_off00013afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1