Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69865872f721c1f…

MALICIOUS

PDF

89.2 KB Created: 2021-06-29 03:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5bd55800d1829e9df751742ff83ff2c1 SHA-1: 88ef0c1b093244da3c4b309f5bc14f9a15505f20 SHA-256: f69865872f721c1fe5cd23eacfc79bb09731d4a94201abf65e95ec2a5b39f61c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://iglozawiercie.pl/zdjecia/file/27930880886.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae41403d2d2---xudojofenesebabuxutuxi.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c070f1efe1348f314abb12da0378b278/56619396590.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b03a9b6207a---34180612732.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/diduzaxunefisap.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/844e0f0be7f304d6a592ee801a335927/63116258547.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9c3a11aeeaca8432f41fc1978d736143/28839645280.pdf
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/dozisanosadelexi.pdf
    • http://bachova-terapia.sk/images/file/51257292154.pdf
    • http://ascensionchina.com/userfiles/file/15938484996.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608395b353598---xemexug.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fca19edfb---69298339192.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/62beb0438ba7a4eebd77870c8f5b6722/doturubozoxir.pdf
    • http://shinies.ru/img/lib/file/61514827464.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/acgbkbt56aemlulnje7hsa4cis/14265835337.pdf
    • https://limblength-sldf.com/userfiles/file/12780290765.pdf
    • http://szkolka-wiercioch.pl/files/file/levevinulupefabotozex.pdf
    • https://ngonluathan.vn/images/ckeditor/files/26674550623.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2in1etls1g14maplppre8q6l14/patalalesokejirebiwegunar.pdf
    • http://pantryscan.com/123cars/imagefck/file/welabuvisidanosum.pdf
    • https://najlepsze-w-polsce.pl/uploads/mojizatujafenikexom.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/d6vhk7q6iqutpbt3k4qsja3ofk/84669853030.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=lord+god+almighty+lord+you+reign+forever+lyrics
    • 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_off0000fa39.bin
710d548a196e832da91179697016251186ad16050d9cb86778b815ae34dd597d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 16644 bytes
font_01_sfnt_off000125b4.bin
c410f615ec1c58d80696676951bc85154753c273fabc3b6f2845251f534ad35c
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B4 11160 bytes
font_02_sfnt_off00013f71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F71 16792 bytes