Malicious PDF — malware analysis report

Static analysis result for SHA-256 971ed6f92a415241…

MALICIOUS

PDF

68.2 KB Created: 2021-09-16 20:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 707e7f57ab573a5cb1a4698c154407a0 SHA-1: dfd50e0d95dc43166978b02b8406fec37f54f55b SHA-256: 971ed6f92a4152419c10ae7cfa0b286786386ecdc252d5f21484e41aa8db8120
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristics indicate it's an image-only document designed to trick users into clicking embedded links, which point to compromised CMS uploads and disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious sites for credential harvesting or further payload delivery.

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 http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/83bfa9362e783fb6d31d7b70ccd00941/41727059259.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf28abd48---7210786650.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1c7b171a---99721916686.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/29296060495.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/vakexuvakilo.pdfIn PDF document text
    • https://airxps.com/userfiles/files/62574827276.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/vamenonepazale.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/gebufuworomi.pdfIn PDF document text
    • https://majubesar.info/contents/files/13665487495.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/wosexegilepaburewidoxiduf.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/99479303896.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/79605841408.pdfIn PDF document text
    • https://vpmemorial.net/images/file/somawijenugovesiku.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/89637582272.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/71519745015.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/79268364578.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/kuxiwifa.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/40627676181.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/fafexijax.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/jiwaligi.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/witisivupelakofofakos.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/17142440350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tie+dye+theme+messengerPDF 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_off0000b16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16E 14024 bytes
SHA-256: 7fe7071f32988d233665279ef2e153ba9b2e4a5c69d7b3740db1a0e0a11516a9
font_01_sfnt_off0000d3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 10444 bytes
SHA-256: 61beed3e820176566cbd946cf60cc32d2521b2adeed5100b709d963365e9113a

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