Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ff35174890c3c8…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 19:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8502b2a0c6a1544db349bbdf5a5131a7 SHA-1: 558304849944b33f6bdee8c6d1550b5a3aca69c5 SHA-256: 74ff35174890c3c87ffa77baf6d5d1ff2c74964ac23532dc2c813bcbb1276950
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic for phishing or malware delivery, directing users to external URLs. The presence of numerous links, many hosted on compromised CMS platforms or disposable domains, strongly suggests a malicious intent to redirect users to potentially harmful content. ClamAV and ML classifiers also flagged this PDF as malicious, reinforcing the assessment of a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=android+switch+track+width PDF link annotation
    • http://aow.infogestnet.it/ckfinder/userfiles/files/jusijoluwo.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/52324681913.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/kapupivakezufaboz.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac971759c8---goxanatulavegegaluzidi.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3255dfaaca2f5fb35ed011b079e4b053/pozugefamigefinoropu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350d4a98c63---tuvumojonojaxetiju.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/susolefe.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/65128705288.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/vexopupok.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/wirarajibawotom.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d395c340---10784859308.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/subabokarun.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/xaxenumo.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/4060261961.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/0f5080102621819ccdc826c9efd80d2f/79639158259.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/63105531320.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/kotaborirevaf.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/40333288522.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/nilenajuriwagakixulif.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/devigazeduj.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/47657900499.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/2ce26ad71d68be59b6b442ea41ef1744/tesufozobibusubanaxumazuf.pdfIn PDF document text
    • 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_off0000b06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06E 13892 bytes
SHA-256: 50664eca4dd202d9ddcae36cc6c1445fc6419b8d8b4be82ae5d2792c2c918056
font_01_sfnt_off0000d315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD315 10448 bytes
SHA-256: 0f62456c0d4b2517725ce08219e5801b738b5df8b5c00384cfa55728d0c37044
font_02_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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