Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4cdc33aab8710d…

MALICIOUS

PDF

78.5 KB Created: 2021-08-18 21:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8b6d35655ac0dc2ed95ca7c34396161 SHA-1: 12127e388ef13ef32a5588e922d0cd5b1adfd957 SHA-256: 0a4cdc33aab8710d983fc8ac2a1facdb0a92140e55ef8db74b4db894498abf3b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack by embedding these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/xojixugul.pdf In PDF document text
    • https://silga.ca/userfiles/file/mupiwi.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/zomutepeb.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/48544806070.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/17497574138.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/kikusodaxabadorawu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/19b99746a0debd681863ba3054be4293/73644686955.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e349b99e9647bad5c32494c9d07364ea/51986362631.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210725_F16D0FBABE9CE5C9.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///rozutitaxunajupo.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/zajusumiruva.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b901c373dad---42850143146.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/42427850349.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ttcc62rgc858kvtbefb354o08/69707521634.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/e33mv655a50hm6i5i82pla5pi2/luxunabafixobasulivukobi.pdfIn PDF document text
    • http://sun-tes.ru/files/file/65777896518.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608f924aa66ba---rusuj.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/63934083750.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161120cb16983f---muwavaripakasugininoj.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1508e6be7---85414803162.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090070d4d2c3---dujepewazijava.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/eq6kd511aouoc1v4rucje8ci0e/lowexaduxibixil.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/93816669895.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/83604425535.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021891951411826.pdfIn PDF document text
    • http://strandedtattoo.net/file/68818787454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+reset+mini+lifejacket+joltPDF 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_off0000cc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC72 17036 bytes
SHA-256: 52c83b24c67682a33f7e6f242f71afb29be9174c29a4a6c4ce8c4269557c1742
font_01_sfnt_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 10796 bytes
SHA-256: 1f1bdcada7bc1bbb627b0385f5ec45b5cb30ce9c3b3d82a9de68192df8498fa2
font_02_sfnt_off000111dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1