Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dc576a0fac266b…

MALICIOUS

PDF

158.7 KB Created: 2021-09-09 15:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e3256f0dea969370fc92fd6a75fa295 SHA-1: 1ad66bfdb1171ccdbc32b9fef29ceea26c495a98 SHA-256: a5dc576a0fac266bffaac644e72fee9a74f96a3cb6437e774ead9345b6ecaf5d
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' suggests the content is intended to deceive users with promises of prizes or funds, a common tactic in phishing and advance-fee fraud. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9736

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://elard-group.com/ckfinder/userfiles/files/relitexikotepamojebom.pdf
    • http://kripasec.com/userfiles/file/39536466468.pdf
    • https://prcomponents.com/ckfinder/userfiles/files/60933675888.pdf
    • http://studiotecnicolari.it/userfiles/files/39276542722.pdf
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/66585360609.pdf
    • http://asr-net.ru/uploads/files/soran.pdf
    • http://www.salac.cz/ckfinder/userfiles/files/wivudomix.pdf
    • http://lex.tj/img/file/95630531545.pdf
    • http://precisao.net/files/files/42165456918.pdf
    • http://fzsvybbs.at/userfiles/file/soporedesoganovumizij.pdf
    • http://chongqinghaohong.com/upload/files/39382297393.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613339c8268a7---muwafigatitotatir.pdf
    • http://ets-sptk.ru/pic/file/xegedubit.pdf
    • https://mn-lawfirm.com/box/userfiles/file/47847489690.pdf
    • http://rajskiewakacje.pl/userfiles/file/99084027373.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c9f8bd5ac---jujuvifavupubiv.pdf
    • http://chono.mn/uploads/userfiles/files/jivodikotuwepinin.pdf
    • https://cambodiadriverservice.com/userfiles/file/murebaxuxuga.pdf
    • http://laiyi-art.com/userfiles/file/83374128613.pdf
    • http://tw-sincere.com/upfiles/editor/files/73549583376.pdf
    • http://alituncer.net/userfiles/file/44622572735.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e757d9a89---bulufefosideduxijumu.pdf
    • http://www.sauminandy.com/fckimages/file/delopebadevajakisubujem.pdf
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/27952321077.pdf
    • http://tjjjsh.com/uploads/files/47391693203.pdf
    • http://bettynblue.com/upload/fck_img/20210905/file/birobebomikoko.pdf
    • http://thebookmarkcafe.com/uploads/files/82058221402.pdf
    • http://severstroysnab.ru/userfiles/file/vumibugakaledanajewo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+earn+gems+on+episode+for+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020786.bin
56034885b366e9dcf1fa4bebcd822f0723918f4974718a142585f6868343b3a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x20786 19800 bytes
font_01_sfnt_off00023b8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x23B8E 16792 bytes
font_02_sfnt_off000253a5.bin
e8406d98ce8c82add035146ceb954d12224ebf221a32cc2917480357f22df0a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x253A5 10872 bytes