Malicious PDF — malware analysis report

Static analysis result for SHA-256 20834dd732ac3305…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 16:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef9680d9d2d801e37346493851e49165 SHA-1: 336ae22bad7b542b9c354beb8792bfc58d3caf21 SHA-256: 20834dd732ac3305e888832e10f56efe2f48dd7b346f6c80bf501375d82070d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://anandtouristcorporation.com/uploads/bogenug.pdf In PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/40364685039.pdfIn PDF document text
    • https://securitydm.com/slicice/file/14637503302.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136cbcbcc961---33404639998.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/3223666705.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/kiritinu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de3ea12500b---mimopamojudapuxajos.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/69752083824.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/37938263329.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/7261853817.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b017c25945a---vudubowezafopuzo.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/14486175844.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/6740094967.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607b46996cf71---2529146787.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/onjqd8v7a9l0p7a2r22al2j217/75750260665.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/wudokalavusa.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac99b01bea---62921199005.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/xemeborifurovajarovepoki.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/difowuguvisezob.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/puvivuvejukiwedejebut.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/b3grinhk7furhqjm15007r5962/sulunesizim.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6328280064.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/labavosubapig.pdfIn PDF document text
    • http://www.celso.org/download/jowukadotomitananajajajo.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/82a5f0989e01db725676402336adae40/2031883529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=introduction+to+statistical+modeling+pdfPDF 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_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 11012 bytes
SHA-256: cda4126c8904ca42972315123e1ac2bf8ae16105719e128109f74dc501618068
font_01_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 18744 bytes
SHA-256: 40c6c99a1ddb20ee4de36f38fccdcb896eca57cc67ff73351365b0f6215c89da
font_02_sfnt_off00012d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1