Malicious PDF — malware analysis report

Static analysis result for SHA-256 805b3596e34182bf…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 01:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba64a31285519d9e4de54054a56bb48a SHA-1: bd628c986035162f28c960e65d3d6cc273e517c8 SHA-256: 805b3596e34182bf44f52dc6e9e53203ce727b95c0b07664476eb7f2a9a36003
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to unknown PDFs hosted on compromised CMS platforms, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to lure users to potentially harmful content.

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 http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/97305105158.pdf In PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/sisoxejatipekakezidepo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608724d8d4177---4898689020.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/shjo06h44ajqmon5ahufkqobs0/navufipul.pdfIn PDF document text
    • https://semut73.com/contents//files/66851021698.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb729f0651---revuritozela.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/jituposupo.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/zalipaviliwatugiwen.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b7c51f256---60198827783.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdca04b5786---96896667346.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6dfca3090---nevusajerenobudukeludakow.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10296018f---tabubitozipixogugoleverit.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/afa0c1912ad75012136673f07da78ad4/nuzozudiguponobe.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/bepifujetiwawa.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/27699482709.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210824_819E49503C2C4D64.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3e651f332---6939709231.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/75436930742.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/b1j99fs789vr11891c8rfd6hv7/sofipen.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4698ebca915fe4ddb2f3bc9b363e586f/nifejizotubes.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ra5lco15iki5psi8e5nqiekjfl/36399077283.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4051c51d4a---70320957104.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a945b00c70---fonasotim.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/durukuzaborivekabofevivej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+enchantments+for+tridentPDF 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_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 17848 bytes
SHA-256: a5a005d8b3963a1e9d619ea7a20c03ec8992c1480c1c0099a623ec0aa6b4ae5b
font_01_sfnt_off000122f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 10688 bytes
SHA-256: 489271cf5c8049406c964cf3da908241b01628fb312c5751a1ffb90ed3bce2be
font_02_sfnt_off00013b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1