Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c84a04d8cb9147b…

MALICIOUS

PDF

85.8 KB Created: 2021-07-08 22:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2507b568d22fb1f7a43f4b6b9886109e SHA-1: 085c083e81488f001c76380c4ec7fb72271a2810 SHA-256: 6c84a04d8cb9147b12cc63e9537a6ec70a14372ab6a52171948e76f8cd0809e3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of multiple compromised CMS upload links suggests a tactic to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://messtores.ca/fck_user_files/file/jekobigoxazemexa.pdf In PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/nhqsojv7cq2tvds0cjllt4h6h7/laruxepizurufibunuxabi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608e92e7d1762---nomarugunuxusamewebased.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/73546260858.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ea7a762c8e49084ad8424035c4ebdbd2/bufurilididezepubafizurid.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/0roigeakakr2g0thto50gct7c3/julodunibepobesu.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/mefinitejadew.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/16886497856.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6aefc861e2a172e838143ef0bc038d83/tewuvokamubebadufed.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/bupokamowu.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/refiwobuxegom.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/68457902785.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/runebad.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4tiam8boil5dqq8ep8kgm9qj1o/36987029157.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/58860441667.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/fc6b54b8fa0bdbe7838ff2236505739c/welezivudurud.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/t0a2d25vsgk855r8tuaoopiha2/74706531638.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/ruwabewaz.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4da95bdd8---buketira.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b20fb0b071a---jopididogi.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/53236074802.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/9112434ca4641fbea28e716a7766dc65/78062818202.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/87159716286.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713dcd6ad29---28116336642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=shall+i+compare+thee+to+a+summer%27s+day+mcq+questions+and+answersPDF 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_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 11336 bytes
SHA-256: f9cf4f9657122ee6e53c71da6ecf1a16cf5ef1557e65c4fc97f3534dd7c82941
font_01_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 19300 bytes
SHA-256: a5d29a1353a879f074ecb5794c520a443c7efa5636ece8dff09178605028b2fe
font_02_sfnt_off00013157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1