Malicious PDF — malware analysis report

Static analysis result for SHA-256 f448002d456a8b9d…

MALICIOUS

PDF

71.9 KB Created: 2021-07-05 08:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6835ab02cfa66ac61975adc3d460020 SHA-1: d382e7f4da3c70b80f34cefd587a3cee3992f65b SHA-256: f448002d456a8b9d60e52d894a532243b275afe76ac17256d696ec7ff50588f9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to phishing sites or further malware downloads, aiming to deceive the user into clicking them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4b32578ea---mizutumimiwogilafas.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1f6e0133ed35f3f551c45afb97d858c6/pogubenewipifulaluz.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/295eb93a59d987b52fa6d72f621846a3/voxema.pdf
    • http://alwaysfavorentertainment.com/clients/879371/File/vudexozutowutigu.pdf
    • http://ceskylakros.cz/userfiles/file/12607256728.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/jlque0vqd3tf9lcsuv9rh8b0r2/fakafejojazi.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607267c21acde---25068202907.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/p8gp2u944f0mbc9nd7ltjuqha5/pigopejulixe.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/691fbad42f13876ce945f428054411e6/jokujunepolokal.pdf
    • https://firsatpin.com/calisma2/files/uploads/10843811321.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/30163900903.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085682ed6046---lolozigokajilupenen.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce76152e9dd---fuxaxobapo.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1af847e358---53405439414.pdf
    • http://polipadel.com/userfiles/file/80388032208.pdf
    • http://chiangmai-clean.com/user_img/files/sovam.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a467e636071---30591982654.pdf
    • https://flardochform.se/userfiles/file/rujeno.pdf
    • http://etasystem.net/userfiles/files/54565728211.pdf
    • http://apexibd.com/uploads/fck_uploads/file/58678667476.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/edc26759b67d3b559218df9468ae3257/2016509901.pdf
    • http://rentaruedas.com/files/others/lasopojepawipivogu.pdf
    • https://dollarplus98.com/images/upload/files/28108284614.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+save+your+file+as+pdf
    • 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_off0000ba28.bin
978f54151bdd7c3da83a243dd116cf234346704d9a0f3a3ab1072903f0ecb16e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA28 10744 bytes
font_01_sfnt_off0000d309.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 16792 bytes
font_02_sfnt_off0000eb1b.bin
76e5816b230129f48e159d4122680d3cffe88d53fb4e653433fa12b3438c6c00
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 15492 bytes