Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc67d7d3457299b5…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 13:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b2d3dc98f542ca6bcb379a31ec81dd7 SHA-1: 3c7b78670d9b64b5bb30ccbaeea5d5ac14275c30 SHA-256: bc67d7d3457299b50444112c4bfeed740cd6ec71b7d986596586e44468ee6226
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://frangarcia.eu/upload/file/rufav.pdf In PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109020026547995.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/32498996456.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/50508968493.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/71da9a08ba481fc02f6493902ac1b78e/78791644161.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/40362171661.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383b3966172---78347065185.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/fagetinenoxivojeto.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/bewufuvixe.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/16292729712.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/87733694950.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/viberututabogaf.pdfIn PDF document text
    • http://irollee.com/userfiles/file/fisapafugin.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/61514354597.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/22357787768.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3ddc0b88b---73853917645.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/fadelisisogekumozowetedud.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/sobadafigazilenoberuro.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/69848992534.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/81442792428.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/nuvewurafujumiras.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210907040214947.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91553022310.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/pubiv.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce75dc06e---farusazigibadunez.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/fulilununenakaburatijol.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/7083993852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=smart+launcher+3+apk+downloadPDF 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_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 11044 bytes
SHA-256: c392975259830441a4f5ca19bd7146b9250289127f4300c672a594bd69078ab3
font_02_sfnt_off00010b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 19480 bytes
SHA-256: b90cb261b7ad76a36edcf64717a4b2889e365871c0efe957abc44287f661b5d8

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