PDF malware analysis — malicious · fdadcc9262dddfdc

MALICIOUS

PDF

86.6 KB Created: 2021-09-08 09:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 01b83d9a326d14006ea5eae10d2d96ac SHA-1: 10a074bc027f1d9caaf185f725dd157953750f89 SHA-256: fdadcc9262dddfdcdbed4751754fc8026c7a6027a43316c454b07745b31c1509

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress sites and disposable hosting domains, likely for phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

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.
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://laborke.ru/uplcv?utm_term=english+vocabulary+emotions+pdf PDF link annotation
- https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1d54ed6bd540d8c36627640fe549d8dd/sufopegos.pdfIn PDF document text
- http://harlit.com/upfiles/file/gokolijapejemetijimin.pdfIn PDF document text
- https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/29cfcf766f2df2e7de80a86caebc49d3/4766168757.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccff2f170d---setelizojateki.pdfIn PDF document text
- https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0f71a47e41b0e0a72f52c9265e7bac57/bobisojunififojuwami.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d51fcf8a434---kedarovatavadeliwuferaluw.pdfIn PDF document text
- http://kazuma.ru/ckfinder/userfiles/files/38940243364.pdfIn PDF document text
- https://terracell.info/images/file/tubalege.pdfIn PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c6b364a8e744f1051fcbc4a33ed65f66/57165259971.pdfIn PDF document text
- https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/93986795d5c162c4168f98e1f959d470/61411935203.pdfIn PDF document text
- http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e7f015b0---jubirujezopazupemozozewij.pdfIn PDF document text
- http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fcf84a82f---61212771815.pdfIn PDF document text
- http://vistobrasil.net/uploads/file/16066932760.pdfIn PDF document text
- http://legalinet.eu/userfiles/files/62766928663.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a86723ae139---56453332751.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f0344ab3---79910757744.pdfIn PDF document text
- https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607036afb5b5a---79935561617.pdfIn PDF document text
- http://reneenicoleevents.com/clients/865995/File/91912446265.pdfIn PDF document text
- http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3542ab8285---pamufomamezusazipuxegolu.pdfIn PDF document text
- http://hzdsbg.cn/uploadfile/1630518472.pdfIn PDF document text
- http://mamitobe.ru/files/file/fononovobilutidoj.pdfIn PDF document text
- https://pharma-tools.eu/galeria/file/tomunuzebalisega.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612be0a9dd95c---guxabunezebutu.pdfIn PDF document text
- https://ctapigroup3.com/contents//files/fataxavalakijaga.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160890fb3ea6ef---32479594195.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e6dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6DC	19608 bytes
SHA-256: `c76b9817cbe23c09560ac1e0017f7366d521a598f4dafd04754e61a2b8c7988f`
`font_01_sfnt_off000119e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119E5	11468 bytes
SHA-256: `92dfa15124cdfd942d17417f57a4c454c455a762b1172c9e68a690072ea3b6c6`
`font_02_sfnt_off00013471.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13471	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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