Malicious PDF — malware analysis report

Static analysis result for SHA-256 626ddbca12a8ce8a…

MALICIOUS

PDF

84.8 KB Created: 2021-07-06 02:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b95a31f0d17502054f4899659712e96 SHA-1: 4a36cdcc2d9038fe7e2588b3b4731d6d65ef9363 SHA-256: 626ddbca12a8ce8ac977f38a436c02b752562a10d380118218f25a48525d9b23
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious destinations. The presence of these links and the nature of the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdee42a7512---23681156640.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acff5402c81---44877543218.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd2b66f0c4---9296953959.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd939e8057---73371812373.pdf
    • https://internationalmedia.com/userfiles/file/boramepuweragikedikojo.pdf
    • http://jaika.in/images/documents/files/rowedamotapa.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe54d96b54---13873641547.pdf
    • http://kjphotocon.org/data/userfiles/files/60597949938.pdf
    • http://photo-preiss.com/upload_files/files/77336596536.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/nina838u30dnn6qciok2ioo09k/21501402008.pdf
    • https://nasikampung.info/contents//files/napusawowesipakipajivamax.pdf
    • https://imotrading.com/images/userfiles/xatusukekubopafojubikidi.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/8d0c7a0f8b6e630e9fea181060eee700/52257870131.pdf
    • http://allycatering.com/userfiles/44394986131.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1f5bb3a69fa75af15781e58cc903a72b/18817542694.pdf
    • https://hanahana.vn/media/ftp/file/15002718953.pdf
    • http://pettwayfamilyreunion.com/clients/39389/File/nokiferafotow.pdf
    • http://seoulsquare.com/userfiles/file/91904153440.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/eaebfd7442790b7c462d137d32c80ba7/4692166357.pdf
    • http://reelproductionshd.com/userfiles/file/fipejabo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+change+ringtone+in+messenger
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e856.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 16792 bytes
font_01_sfnt_off0001006d.bin
d937c1349e938db7d7e21fad8762f52a3b99bf008501db20a9e3c2b47b6d65f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 10708 bytes
font_02_sfnt_off000118de.bin
ba0cd28dddb3f17575c0c96da5381e035e29cc0d95af13d68e3a1e0f0e9b43f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 17316 bytes