Malicious PDF — malware analysis report

Static analysis result for SHA-256 a609584bbbd963d0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 15:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee37ea58d6ca37237eda8353095450ad SHA-1: 66e7d1c8f5e0d8fb3cafe267fc3e0a764a1d48e8 SHA-256: a609584bbbd963d0a58b08341e537c1fcd4b9041c4a33ef667437380128e6a41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.smartusb.info/images/library/File/lobejitezafomusexalobaf.pdf In PDF document text
    • https://vatlieutaphu.com/upload/files/madipore.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/mapomizogil.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/potupog.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/nawariwinizam.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161365fe19a7c1---lunopuvadejodeb.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/kedoralazisuti.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/90362321930.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a25dba8ff698c19179dc61fae309b29f/semewiwubakiwekuzexid.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/vovidujexuzekutajej.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/98496674106.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/fepiguwovasunizozesobip.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/nodadopi.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/jifixafukizukinaw.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/95912077209.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/49201339299.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/xedewi.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/73591140183.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/49436795502.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/9446678262.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb3554f161---12174875823.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/xirijaforodovunokodoviw.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa14e4043e---bevem.pdfIn PDF document text
    • http://scarpatti.com/files/43097876187.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/dedu6nvpvvfcds5airitargk0c/24310090692.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/39896336015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+cast+my+phone+to+my+ps4PDF 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_off0000dbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB8 10672 bytes
SHA-256: 0b68a5bf8c40d0c3111fb9d078ae390fbef47d082d2f0d65ede6f5bf0cd2f81d
font_01_sfnt_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 18176 bytes
SHA-256: bb7932f5e186d6ff76a3a45887f58968370dab4347693e12b170c1c2cad1900f
font_02_sfnt_off000123b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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