Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f8f44f5a833522…

MALICIOUS

PDF

97.8 KB Created: 2021-09-21 19:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9abf2b4e0e58f30f206aa73fa0496644 SHA-1: 588655bd855ed7538c54853025a68fcd23066f31 SHA-256: 96f8f44f5a83352209c7aeecfc846ed55f8ed1123645711012bd8f452771a1a2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of multiple links to potentially untrusted sources strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://yetisirkaucuk.com/firma/files/jalisa.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0e442153a---bikererupunad.pdf
    • http://ntvietnga.com/upload/files/69299025219.pdf
    • http://hondatayho.top/img-ngocbao/files/40508937962.pdf
    • http://orderkiwicafe.com/uploads/files/baraniripoxajox.pdf
    • https://1tlstar.com/storage/uploads/files/judomaxazamivanekizuvi.pdf
    • https://essuances.com/ckfinder/userfiles/files/52488639222.pdf
    • http://e-instar.com/userfiles/file/34475891987.pdf
    • http://dongkoo.com/uploads/editor/files/38707974268.pdf
    • http://taociren.com/upload/file/210902031228308877fz7hmucknhvo.pdf
    • http://cyc.cz/pictures/clanky/files/kijoboxupafaxe.pdf
    • https://sibservis.com/ckfinder/userfiles/files/wuvurozaxes.pdf
    • http://snieznik.pl/userfiles/file/89198369199.pdf
    • http://myphamhelios.vn/luutru/files/99025449502.pdf
    • http://4998horo.gmmwireless.com/contents/files/1458840753.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b155f2da3---lisubexajixuxa.pdf
    • http://farmandari-sarvestan.ir/images/news/files/54195593344.pdf
    • https://loyallcanada.com/editor_files/file/80278448744.pdf
    • http://eortak.com/img/fck_temp/file/34812377304.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1014d8daf---tajanef.pdf
    • http://fukaofoods.tw/uploads/files/202109170719461011.pdf
    • http://jingyilin.org/uploads/file/zabufosolukijidil.pdf
    • http://ih-consultant.com/ckfinder/userfiles/files/leneperonikatikimuvu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=is+ytterbium+a+metal+nonmetal+or+metalloid
    • 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_off0001188c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 16792 bytes
font_01_sfnt_off000130a3.bin
c26f560a6cca130df4cd108142c4b392ec3fb8d97bb77a8213895fc4c75b692f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130A3 10712 bytes
font_02_sfnt_off00014935.bin
08af08b1376347225d6b206d43a9e7c0dce776730389620a63129a40d648f97f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14935 18432 bytes

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