Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e38e31cdc93c95…

MALICIOUS

PDF

67.6 KB Created: 2021-09-24 13:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8b79ea9e5a4ce62ef5870c6e06037f2 SHA-1: 6a080031f1ff6160319257122d2b6ad323854a94 SHA-256: 91e38e31cdc93c95f45be2c3913e99ef895992a3e78977a95795873e10cf8c5c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains numerous embedded links pointing to various domains, many of which are likely compromised or disposable hosting. The 'PDF_IMAGE_LURE' heuristic indicates a common tactic where a visual element masks clickable actions, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of numerous external links strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 67 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://foodvellythailand.com/upload/files/pefodopodiros.pdf In PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/kelawiwir.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109092248596869.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/tanazap.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/32328357241.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/97197446567.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/wezuso.pdfIn PDF document text
    • https://luminex.pl/upload/file/73672387839.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/vudinus.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/17291463584.pdfIn PDF document text
    • https://kokomanis.com/contents/files/tenexuzagaladamupaderonur.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/zagawokugat.pdfIn PDF document text
    • https://emenu.hu/editor_up/mibemajubebid.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/77965298799.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/radolonufexur.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/90643046955.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/39ac863302bce9ac52aa8652f81e7088/12878740739.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7t76hc3bj9nap8re2mc9nhbi5e/71768350679.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/fipetixisexukenupu.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e52b5a4500---nipazijaz.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/siwebokoverokadozonijuso.pdfIn PDF document text
    • http://centrons.com/uploaded/file/14071944576147850f8d9c7.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/puxoxipotanuzuviwitiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mirzapur+download+full+moviePDF 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_off0000ae1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62C 13912 bytes
SHA-256: fd05fa7954aa098b60ca8d2fd0ce5ecf4cf62dae6b8bf4f344280095998d9f39
font_02_sfnt_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 10700 bytes
SHA-256: e8339c275c135d65bf06a48f69c633d16519c8fe0e91369e7f830e26275f3b94

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