Malicious PDF — malware analysis report

Static analysis result for SHA-256 864ec7fec08f1dc9…

MALICIOUS

PDF

93.1 KB Created: 2021-07-02 18:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d1f9c7da3137d5f488c8692ac4bff183 SHA-1: 73add3aba804329982d8afd6e96054793ef0e79b SHA-256: 864ec7fec08f1dc9c87b40d2c20a3046aa77e95c905557ae680c4292083c9786
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The primary attack pattern involves leveraging these compromised sites as a distribution or redirection mechanism.

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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095448127161---dugufonejipuzutijor.pdf In PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/10bf868297f7785dd013b0cc7b9ea09d/rananadevisinafusejoxuru.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/2kmhoe5f7bhgrr7om8fr6qh0a1/69673949961.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/tkpmcjcd761bri6uaktqtf5v97/28664219246.pdfIn PDF document text
    • http://vinmexindia.com/uploads/tatakovazitowexafabexaru.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1ea6695ce---79835325729.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/79119854345.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/gazuvibelaruwumotate.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd7e385a0bcc14fd8526ec629f339648/vusaselokowatimulemorul.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/jonadazolanobidora.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/6476635558.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/eef9b5cdb666a20a850ad67f9dee89f1/tawugebujamejajepex.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/5rpdrio357jd4t9mlkji9etcd6/3085141665.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790264bb0bf---89431250638.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/62099500510.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/433bcfff7759922f0d8e761b63833877/8868766909.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/18454246394.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5344af2d4f5f85ddf7ca5b9e433b766c/witimesukuwanuwafagedekum.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/davovupisopananipisut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=facts+about+failurePDF 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_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 10440 bytes
SHA-256: 1b39dc9084eb3b7595fc8abcdd2282a908024780d9e99e1560f2f180892c3953
font_02_sfnt_off00013b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B55 16976 bytes
SHA-256: 14d2ff936faa4d45b25121335722ab0259c254c604e32d85e3880eb7ecd4bc77

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