Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2e9fea0850aa89…

MALICIOUS

PDF

92.4 KB Created: 2021-07-21 22:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e930ef2ff4f9532ca29f8f11255757d SHA-1: 61be0433a3b3d08820ff77ca203081d4ed1d11f9 SHA-256: 4c2e9fea0850aa897740ed8289c3bc49cf08ec81383b1225d1a46a2a33bb960f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are either compromised or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially malicious sites suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://studiogalata.it/userfiles/files/mosepetotutuwoma.pdf
    • https://lotte-ppta.com/beta/assets/file/24432712170.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072271b07828---wugibuteladizorilose.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/guzagojemumolevatupiw.pdf
    • http://sosnovgeo.ru/userfiles/file/wadoxuwowenevubuv.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6636c00e0a710e74f700f6327d620387/kadifezan.pdf
    • http://nutronicltd.com/userfiles/file/jedukuzawoduluneb.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2f6aab773---fovozitimisaba.pdf
    • https://palet-school.com/files/files/ligak.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/70707b748190886009c24198552eeb9c/9351745976.pdf
    • http://asustainable.com/global/file/4399077501.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d900955a2---linovuledemofu.pdf
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/27835766479.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7a02822341a7ebd765f8977637228253/72176900294.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/dni0f1891goe20dqdcml5i8jvq/1678458669.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e021faba68eccacb141f7003524fb73c/90743957378.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c3def5b00ba---74826828956.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160744925072b0---wegizemofirujosin.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/38lsfs6gb5v2d9oaq4uu964f14/xijojuwapebap.pdf
    • http://ristoranteyuri2.com/userfiles/file/zolovazikusaxaraf.pdf
    • http://worldnaturalfood.com/image/upload/File/15239393363.pdf
    • http://enovosti.info/ckfinder/userfiles/files/zimexavivavuwi.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/d40snme3bg7r35uklm2kh6oief/63595756250.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c6bbfcdf---19200864780.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+pdf+reader+for+macbook+pro
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa16.bin
bca5532cacf86dcb9c1f1a9f4c29d35fefbc4c52d92d412e541433b0d90405b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 10484 bytes
font_01_sfnt_off000111a6.bin
4ab02a1827cd72fa4c0ac9448379df0fe1b74c2790ae47e7f3ed02b9d66ca137
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 18856 bytes
font_02_sfnt_off000142b0.bin
28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
pdf-font-stream PDF embedded font (sfnt) at offset 0x142B0 1696 bytes
font_03_sfnt_off00014ac0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC0 16792 bytes