Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb573757f17e8484…

MALICIOUS

PDF

85.7 KB Created: 2021-06-28 12:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb3809dacf0daf0cda539c297edb66a4 SHA-1: b5022d9373e373fe55f3a80a064f1aab8e1b3ab6 SHA-256: eb573757f17e84843b103ca035c316598baad716d632fe3216dd50999ca76662
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the presence of numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coeb.eu/userfiles/files/76854922101.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f43ad3c47---linaremu.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qcvb3t4sm0rm9jahutj38elke7/11835896238.pdf
    • http://alituncer.com/userfiles/file/fosifizijoxodogugeve.pdf
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/fibafuditoboterinu.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/hfmm3tur5m2d4sql1d6skv1iak/porudekuposin.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fsmhbak6fd641sa2n617bqq8fn/xikudabivovetukulewa.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/babc5d7359519f1c89cfff4d8093d40b/35902996778.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e865479b7e0dcfc8eac1b905298ad9ef/sitoguzubugumokino.pdf
    • http://innotec-industrie.be/userfiles/file/78584780463.pdf
    • http://carolinaboatclub.com/userfiles/file/xejilemufasinegajoli.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5bff1363f---72701786246.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/27ae7945372cf0a252c3485f5beda565/lewesisigerefegivevapesaw.pdf
    • http://ithaca1962.com/clients/41687/File/lovabeze.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5b2a990f4---zeseb.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/41frkd39fl8pc3svb0bej09n3f/44265274039.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73f68fded---75520621985.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b0959d71a---39800611302.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a527e65243d---23411482513.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a903deecc67---95615801369.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/965c41f4231c3ebe6f7e71e6b3f2bd75/liraxotozomujupefu.pdf
    • http://allycatering.com/userfiles/83379508074.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=times+now+daily+horoscope
    • 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_off0000ed44.bin
d75898a288199ba4ed98375fdbc711a014f58a469bf5a473e8dc1d386247beb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 16836 bytes
font_01_sfnt_off000118c0.bin
2d89a160fbeb9f5af4e33205aa862fe5a47e28aa835fe204e68b7a77059e9952
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 10844 bytes
font_02_sfnt_off000131a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131A6 16792 bytes