Malicious PDF — malware analysis report

Static analysis result for SHA-256 701133fb468f4edc…

MALICIOUS

PDF

76.8 KB Created: 2021-09-06 05:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbd38f09fd6099be4e29f35aa0ebc317 SHA-1: 194bfe149703d8f88b1a2a6df2bac0ae41a080d3 SHA-256: 701133fb468f4edca24b496b4378c3dea6f90748078cdd0e639d002cd0712893
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, many of which host further PDF files. This suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c35745f03c77a0b97f1d38276d2363e4/ludisugagavawolitotuvevun.pdf In PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/l812tfslt8hp32qlhru0n91255/20994386977.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/rawiga.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/raretagezufusetitakuna.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f5e6cc610---54442562400.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dbf287b32---wexejorijopowesesokedigi.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ad07037f6534efc53ac929708c9880a1/94197171545.pdfIn PDF document text
    • http://bienbao.org/uploads/files/47031791355.pdfIn PDF document text
    • https://hostingpazari.com/calisma2/files/uploads/76806922162.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/xexerefudow.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/buxaxerubuzafa.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2764ad4672---48621203442.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/31f6b5a40da816bda1a39bdbb06ae0bd/53417684755.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/55122162653.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e6c565fe666b9c54720619581e9c0cb/82338161767.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ef21b228---wamavubododebuvevexu.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/37820104666.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/136f085486be3dd0d6e72b4f367b8379/jurodobokugoref.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/56075041063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=icse+concise+biology+class+10+textbook+pdf+downloadPDF 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_off0000c823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 11352 bytes
SHA-256: 241e57767a60ed3281b19b2881a97b7c5dee43b092d7312073e2350bafdf3e2e
font_01_sfnt_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 16852 bytes
SHA-256: b477c19a6a079a28b2772cbf84b5870b3588cea34e993bee972f3848ebc7469e

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