Malicious PDF — malware analysis report

Static analysis result for SHA-256 35042f4cc9220320…

MALICIOUS

PDF

88.5 KB Created: 2021-07-29 18:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3cbe336299630de4fd4aa5a1b0665dfd SHA-1: 55c4146c04dd195b277c99bf2bebcf898a552be5 SHA-256: 35042f4cc9220320362cb6759d5f1ea041ae94377c17df03f8989e316ebc410c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm pointing to compromised CMS uploads and disposable hosting, likely to distribute malware. The presence of a 'download button' lure and a critical ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests a malicious intent to trick users into downloading a payload. While no scripts were directly extracted, the overall structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=how+do+i+get+autocad+for+free PDF link annotation
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7fca7fe7b---zobegiwevave.pdfIn PDF document text
    • https://ka-base.no/images_content/file/29241206470.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/motemenibi.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/jakanewipuzigapuzifi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/23294654373.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/fejuzelizoretosavisipifen.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/10cf62b41a293bb4f7d3a372744fb1a9/zuzewigopukugejif.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/wufidekafeboxefaru.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/93248766118.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/gowolixoj.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dee2c5e1e---82651177284.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/jitamowivowave.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/4044603959.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/xumum.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084956a4fa86---34525471611.pdfIn PDF document text
    • http://sbkf.org/files/files/vepeso.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/zototozo.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/retinidezubabulovo.pdfIn PDF document text
    • https://energooptima.hu/upload/File/33911296909.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/darulutubudozow.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c4587b3eb9cc180abef3cfee3e6fb67b/54921639190.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16070d4f2db38a---tovirabutademarop.pdfIn PDF document text
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/bojir.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_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 10508 bytes
SHA-256: 44aafdc64cebcb52f2a8185f1a0db70946f5f3b74690155c7fc2e223195d51ee
font_01_sfnt_off00010e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E59 17512 bytes
SHA-256: 541c6357107c5d96d93a007c8c5cc49265ceadc9a44660f1403eb4519a748ec2
font_02_sfnt_off00013c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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