Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2bc86679fb2b0f…

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 07:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb1eff7456c1e4098bf1ce5fd6c3a91d SHA-1: fa40de68615f4258ed5952d1865dfa20e53692d5 SHA-256: cd2bc86679fb2b0f3bdba4138419657f2088ac57479a6d0acce824e9f3912eb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The presence of external URIs and compromised CMS upload links indicates a likely attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=plays+for+middle+schoolers
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608141999a8c3---98113571973.pdf
    • https://nikosdimos.gr/userfiles/file/vivurusosoveredukem.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9baa22d8---49343241296.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/bmp5upq499bum2pbk2d52nb0l3/panupepufapuliwixaxi.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd00502f4---30706422581.pdf
    • http://skiflogistics.ru/userfiles/file/xavelas.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/kadiposigusimamalat.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c9f62576e---84770567511.pdf
    • https://binarbaid.com/public_html/userfiles/file/69136663120.pdf
    • http://omonetach.pl/foto/ilustracje/file/70925848588.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607add0f67c91---jepugi.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/edlarbhhbnt7bpvlk4jsuor4k2/jijuxagilalunulaxefoj.pdf
    • http://shannonlakeestates.org/fck_images/file/fowaxazunuwekenesa.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982218e0bd9---kalusowexabogixotuniz.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/fc682e9b0ef7193762f3827bddeace24/jibapijizif.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/34802449166.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/78cdc7775598c713ca975033e8a27322/52518815832.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b36a67bdb---labazalodoluxomipofujogo.pdf
    • http://myphamlulanjina.com/upload/files/wogasamo.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e7bcef78---logisivijomo.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608700d128bdd---kesawofusirojatisaj.pdf
    • http://iseveranscopy.com/upload/editor/file/90307368313.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/82057ff1ed2c86094efaaafe73e80ede/puxekejutowu.pdf
    • https://rocksoliddesigns.biz/userfiles/file/wawijamajikelewiwexatidat.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_off0000f955.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 16792 bytes
font_01_sfnt_off00011167.bin
670db8bf1f225c9df413611bec66be782bda59e4e3f43ffabafc678d14706862
pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 17516 bytes
font_02_sfnt_off00013f00.bin
f4b44118baa206f6d74afb5ecc1134b966057c108d4b3ae48c80114144326662
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F00 10656 bytes