Malicious PDF — malware analysis report

Static analysis result for SHA-256 872396a8e4c6d619…

MALICIOUS

PDF

86.8 KB Created: 2021-09-05 08:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abb98781cee48b989b33c690eb2834c5 SHA-1: 189bb82181cbd4a27ccb26b5e1f083e924946299 SHA-256: 872396a8e4c6d6196594a6aa3536c22998465983ff0c48f96b766d0bed7c9db6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm and potentially malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=presto+pizza+oven+manual PDF link annotation
    • https://ever.dacola.com/upload/files/vewaxaj.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/dubibokafosazolo.pdfIn PDF document text
    • http://askaudit.ru/price/91343822414.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/eb4iepi411l0j1hbc0bette590/20245477477.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/16759879206.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/vizewikivubevo.pdfIn PDF document text
    • http://liberty67.com/clients/41815/File/63638852625.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/40149764054.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/7d0f43019db2da04b3869e6e7dc1d82e/45373210423.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/64603821058.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/20843721048.pdfIn PDF document text
    • http://irths.com/upload_files/files/puradekiji.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/viwibikukowinajewagavu.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/39486875735.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098454a465ee---49475247142.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/74473980376.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fb139f7105f---ridimogilisezimagur.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/1810330786.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/jepuvejepawifasirib.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160741933acd9f---lanumifilasapapejagufepu.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/78889810420.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fd44a2bc41aefbb18d6fa4628406d282/14609259114.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/xesiwawifu.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.

FilenameKindSourceSize
font_00_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 10640 bytes
SHA-256: adbc6a8057c6f89ac3a2a2bc704b7d6e2dbbaa3bc18ca26d43d84b5f829766b4
font_02_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 18300 bytes
SHA-256: 75c61aabd80c33d5fb6e0a15b9f39f988423f83871ca9f70ef392fb9a1529f7b