Malicious PDF — malware analysis report

Static analysis result for SHA-256 54204ab90d7a2df9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 15:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 291b2ac281e0d48bacb98d79f75d9c8c SHA-1: 8dff14a9e02f3d60bb23ca2a22eaddf19bde783c SHA-256: 54204ab90d7a2df979951c24b7a8a32c06c15ca2cb0746b355a5e66a29cafa00
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cp-tournament.org/ckfinder/userfiles/files/tufiruzukolojabijuvinuzo.pdf In PDF document text
    • http://m-s-g.ru/userfiles/files/neribabewax.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/rukolurodefetikijuxer.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4ecbe07ef4e5a501044b6f0294e10f7d/45024141058.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/porizez.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/42594987142.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161417f66d55cd---15520875368.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/98493200234.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/55952187124.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/suxiponokutonuxuximel.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/paxazo.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/17122132718.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/natapakekarokodizi.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109031155182218.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/fegibudisixijoxeg.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/66587302156.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/xuriwagireril.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210909024948.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/85521764051.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/sevofepon.pdfIn PDF document text
    • http://healthywithhart.com/res/file/karudedi.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109040046418918.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/jelowogepazixegutukomabe.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161304f0b2fc3f---67523112356.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/24150530493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=1000+reading+comprehension+pdf+with+answersPDF 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_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 16964 bytes
SHA-256: 866c2c7c2ca1cb670e99c5728b24e8f9d5ef67520771b35f45d53e21bf327bdd
font_01_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B7 11184 bytes
SHA-256: 2cf3991a2bc50e1a75bfe3992abb602e059ec92348a5c40fa2b18f21ad4c8d63