Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28538b28f1d020e…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 05:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bbbd4142b90471d56bb4e2edddf1c7b6 SHA-1: df45e389c0065f5d534f478481ffd27e9799ae5f SHA-256: b28538b28f1d020ea18662be3413d5bf11093bd7bee57a93b87b792bb38ae110
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external links, many of which point to disposable hosting or compromised CMS upload directories. This indicates the file is likely part of a phishing or spam campaign, attempting to lure users to malicious content or download further payloads. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://albatrossmrn.com/konadnew/userfiles/file/xarotojawedabonaderiv.pdf In PDF document text
    • http://www.provinces.cmcgeneralate.org/files/js/ckfinder/userfiles/files/69872207601.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/dafirokejo.pdfIn PDF document text
    • http://standdominica.org/files/files/demusonori.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/33459847372.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/lemavegafemabupoja.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa6fcd7b87---nasirutavat.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/63412264442.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/83429901580.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/gcvsphirh84g2gfso9uuc122v6/gagovukofupit.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/pqphuhjrgnhh13qhbhoksrabgb/39192981616.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160742b5c2f055---newabijilenor.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b6f02c65b---55537682385.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e72945616a---xarekutoxiwisu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fd480f902---rekorizegoxujepi.pdfIn PDF document text
    • http://www.bash.cl/media/file/8981501145.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/4219995013.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/70908740299.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c2a8f22af---19325250834.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/52953371997.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/sitidaki.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/31035334057.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa06ecec5---makevonubovajavizawe.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/xomuvogime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=subaru+outback+2012+user+manualPDF 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_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 17552 bytes
SHA-256: c1787bb6893ff894d7cdbb94cba8141f8432356dbc3b8b6ea9f7e0e8927d2fd3
font_01_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 11000 bytes
SHA-256: d16e14d7a98c59c9fad050d36bd1fa12a61ffa26508a6876f253260d122007c1

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