Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2061f8daf8e359…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 04:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ece2dc3cb832cfe2868d5e447fc49fe1 SHA-1: 419ca9f8e04a9798b9d4841db0610a6bf0a22dce SHA-256: bb2061f8daf8e359d924ddecb1726c621355ef42061e4051fa9ce4dc426247aa
176 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains multiple heuristics indicating it's a link farm pointing to compromised websites, including WordPress uploads and potentially disposable hosting. One URL uses an IP address literal, which is a common evasion technique. The PDF's structure and embedded links suggest an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a5ea4dde---8006236762.pdf In PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/megapofoxisodemuledosite.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/giniguzaxixojubaxinofel.pdfIn PDF document text
    • http://aurora-c.jp/files/files/72973188590.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/fonakapewedudegakojazuze.pdfIn PDF document text
    • http://www.puhito.hu/uploads/78748670401.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/rirazoxovemasamuxekat.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/3810987233.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/baruwok.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161436a33c290b---ziravipesepizumufa.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630957758.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/sawobipuvarorusek.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/vobezidelezesi.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b6b4d32b0bcf2deab8c3a55a11cf1d73/25735808815.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/mosoraxinubawiwusogariw.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/80320902935.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/d9ese9896bq6r6nqp4lv6c40mv/12742846835.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/54696403984.pdfPDF link annotation
    • http://nagymester.com/userfiles/file/romuxokigageto.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/muzudekajogiriteje.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/40429762538.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/98626824975.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/64437391589.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50935117777.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/8668038576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+set+daily+data+limit+on+androidPDF 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_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 10600 bytes
SHA-256: afb6dbf073551b5c13fdaf85bfa970034dac24ef76a7cacdf3188015e59ff86d
font_01_sfnt_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 17288 bytes
SHA-256: 92b4f2fd6568e683f4ca6b508cb32501b78b9ce9361bc1fc8a217f54b30085b7
font_02_sfnt_off0001205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1