Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff4c3ee0861b139…

MALICIOUS

PDF

86.8 KB Created: 2021-07-23 16:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 325e2eeabe2284c634e664f444b11ab1 SHA-1: 8e1adf8265e8af1f1eb92bb5c0660a3ef9e2c9b4 SHA-256: bff4c3ee0861b1396d0aba1051f36631c6ff6d34dde0fd847d2590d9547a002c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious files. The 'ClickFix' heuristic indicates the document likely instructs the user to execute a command, a common social engineering tactic to bypass security measures. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://hrzservices.com/uploadfiles/file/lilomuzaxoratukesov.pdf In PDF document text
    • https://aduanaldelvalle.com/userfiles/file/vefujabug.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b5b34b90---kobagagukozijowijimumugif.pdfIn PDF document text
    • https://aokman-drive.com/d/files/sopebuzelizulovaw.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/72391687439.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f520fbe4c776c7838cbdaca1f3e9c4b1/tafaw.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/892d75990013af58bdd42b13b5e63ba2/41204474712.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160873e53022ca---7431466222.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/muwejafomasepovefatu.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608cde454f706---lulaselezo.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a4d17ea76---dexazukiwafew.pdfIn PDF document text
    • https://mnlex.it/file/wodaxejawonatabiwe.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcaa003505---519121843.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/44493309894.pdfIn PDF document text
    • https://datawire.gr/files/files/sazokakagigurenizodokal.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7c2e898028b4fdd084b62a8dcf03393/13498740200.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/feberogidupetil.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/95952927334.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/32121454147.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/11974225711.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/pibelotivubipexepusazu.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/werazimizexovibunaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=logitech+keyboard+k350+number+pad+not+workingPDF 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_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 11664 bytes
SHA-256: abb840a02266d466ce08e7625ae8e0a220a964665c39ea4989a8ba8c2dc46577
font_01_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 17252 bytes
SHA-256: 0c04fc3aee079246edfd71055e1767d10b503eeb2ada4a45a9264c277f907413
font_02_sfnt_off00013497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.