Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff7ba10e76da73a…

MALICIOUS

PDF

108.5 KB Created: 2021-09-03 00:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42144a61714da617dbf70f6208171879 SHA-1: 4456c983689894015b0b296aaf2bf28f481343f4 SHA-256: dff7ba10e76da73a1acf825b104e160bcafa08eb422bd58785c93143e584bd4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute further malicious content. The presence of urgency language further supports a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://playworkspartnership.ca/sites/default/files/file/jaduzudomigipexop.pdf In PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b5fe714b5---kamelujuritit.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/bd158df0f08b487538ac6799401a2501/55460288423.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/wetivigasidafemekameg.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4242a76ce5---suforivutapogexosawidudef.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/1eoak53peqis0rjkkqss3jarr3/97175407496.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af87ba4d474---sekus.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/5d552bddb28eb8188364fc12ef4b692e/dikuxuxuxaz.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/7007243197.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/2r8ndq8du6jfffvvuhpndn5ec8/powuxisumivumilajemuzofel.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097178f7ea8d---lowanerox.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/30178027744.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/26534971760.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf7b60eae3---kapuzikixobiw.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/besejosefogetasusujawano.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/lijutujegakakedusof.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/72760166782.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7772240bb---85847352774.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/bowasojesuwadarawaxavobat.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/23760020109.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160857bd24e75d---47846323557.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/13b834112168567bfd9536c652052ce1/demibojoxip.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121709f5219f---gevumupozoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=culegere+limba+romana+clasa+3+pdfPDF 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_off00013e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E72 19996 bytes
SHA-256: 6a703e84acee7d974dc58db1e68e70188061d15f17d037fe61563d2d83e3ad9a
font_01_sfnt_off000171ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171EC 11308 bytes
SHA-256: 136d72614ca1aac41c923f1af7ea04e6936672121e38f01326cafcff9f675890
font_02_sfnt_off00018c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1