Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75bf61799e8967a…

MALICIOUS

PDF

66.9 KB Created: 2021-09-29 03:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 652892242bbe52f6bfd2c37286fff17a SHA-1: 39430bab4fcfcb0c2536bbff450eb18bb6f172ab SHA-256: b75bf61799e8967ad7d9bc720282c08336738a79926a2ae3949cd20ea0f81b81
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The document's structure, being image-heavy with minimal text, further supports the 'screenshot lure' attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 66 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://cructi.ru/uplcv?utm_term=doc+to+go+apk PDF link annotation
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/962035876.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/bubipufivaviwefelawovago.pdfIn PDF document text
    • http://temple.mo/userfiles/file/molebebip.pdfIn PDF document text
    • http://lex.tj/img/file/34092425415.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/mojovikumabifomiwiwuzata.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/6508194092.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/wenirolegokatetewirajefa.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/71409348849.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba3f8ad111---zotonokivilimabiz.pdfIn PDF document text
    • http://urbariatprasice.sk/upload/file/jarazuxolo.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/bolipubovoguwamumenabel.pdfIn PDF document text
    • http://simonide.org/userfiles/file/89496531263.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/4c7d0333466fb112cc35b800117ca27c/xonufibowozaromeli.pdfIn PDF document text
    • http://oilspecchem.com/files/60992590467.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16152220d33cc1---jidenoret.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/63987261186.pdfIn PDF document text
    • http://liluby.com/upload/file/56300790353.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/kuxezajopabuvudidopuvi.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/xekedabojanitewojiluvu.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/17640850291.pdfIn PDF document text
    • http://kd-council.com/upfile/files/82431989858.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/44118599639.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/51447658532.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/dasikifu.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_off0000ae4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4A 10000 bytes
SHA-256: 3418807bf4c9fd6d9d3b65631b7297d94c1a9988562fe2993acdef6e880919bf
font_01_sfnt_off0000c49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49D 13712 bytes
SHA-256: 7a0dbffe950717ec28373dc5fc63a9d5c6f8cd33eab54879cb978ccff1a31472
font_02_sfnt_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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