Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4517acaa918b4e…

MALICIOUS

PDF

116.4 KB Created: 2021-08-09 06:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ccec1b7c6861aaa25d94d2f984a8e23 SHA-1: 96a042907719e2fcf2bc4c1a03f5f2342bdc016b SHA-256: 6c4517acaa918b4e53cb3dd96203e59662c19a0df1483411203fa5ff7764d855
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/69j3csm8uu8ks0o63lcc1fr2p1/woxij.pdf In PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/d4835ce630d2d0f5443a37180d24cf3b/24443915490.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/81336652755.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/62b2fb3d5545f5ce0195614302069919/tekajorovujekawu.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/64757005034.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6lq5aa83honasqas5270ci4lia/24175724555.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/6a1cefe562951e2f196e61f4acdd5970/sekamovuxifare.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/44875503615.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0f7550e8b---vajiteg.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/sakikabodotajonewixuriv.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mupakowipapanizuvel.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ae1a17bb4ab2df246adcc89e789358f5/97145076592.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/lu8ubi2n30hom92thrcg31f8d0/8508144834.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/71315317518.pdfIn PDF document text
    • https://beaszemin.com/files/72556260577.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/jusujivikoxapujozajuduxe.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/xitusosivaxuwekisabefo.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/dajubisamopewawonasef.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/13959510038.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/nabonivizuvazev.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/15hrsvkqa127f5kap902apnuoh/zuluw.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0eba0f17292d0effcb5534fe8b8c6666/8209552703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+reset+my+ac1200+extenderPDF 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_off00015fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB2 18596 bytes
SHA-256: 31cfd05d8c143790977ef79cf066a885e3b0d3d23ddfd527378c90c2314a6e19
font_01_sfnt_off00018f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A799 11072 bytes
SHA-256: 2407ee63afa8933bceec93d2a261daffba190d0d5bad13d150adc5aee2fd65b3

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