Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2a50a58b044009…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 10:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bc1c5be3aa2fc786f9531f7fe6fa1d9 SHA-1: 1cca0728caea2c66f639d5b2470bebf6c74115c0 SHA-256: 1b2a50a58b0440099deb6e5124858a6a213b1d42b9f1fed6ee503a0fc9fdf199
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites, forming a link farm likely designed to redirect users to malicious or phishing content. The presence of these links and the overall detection indicate a phishing or content-redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdfe85ec07---17138437400.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/4v8u8r1b92kiaiuuuoqo9pj5l4/fodobe.pdf
    • https://decoveinvestment.com/userfiles/file/78150525808.pdf
    • http://tourister.kr/userfiles/file/gozemulobugozodezulif.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3875a3b0dd---fivuvivanenufimij.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/34536683053.pdf
    • http://wjcopy.com/upload/files/totaxagusuwanumubifu.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ael27ksg47t2s9l5c5qupcrqlp/38560811164.pdf
    • https://ubranni.com/uploader/files/mirajipamotazeva.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/0h32sm7acirelufo55qblhg1e1/53936494439.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3e471628003672c2a9a2404c1f66a8c3/76985062122.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160810f3e3eb80---kilawubawepi.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/958bb88265bfe8547685922b192fb68b/13524554526.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0faaf90e914e843d708be07bf6c59cb4/warimij.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c89af93205c105f80af226893abefc9c/rawukonekafutip.pdf
    • http://congtydaihai.com/upload/files/18930093403.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c112012663a---63222721000.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/85432992129.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/130eb260541168bf0a23ea88ba4732b2/73161707919.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4n423gmn9co42r7imiiep73u7r/22263416428.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce23002e54---gajel.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dbdbd4fa3---sifubebep.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/004f0b6s5g2c3p0clogohsnlg7/xodex.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2c4621a0ee974a3c302e86f6ad4c5951/63562666978.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=infected+in+the+world
    • 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_off0000ed8b.bin
3b0e199ad2cacdb0cdf2831ee048a8b4fad2c576d1a68239ed32ec80ac49129e
pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 17124 bytes
font_01_sfnt_off00011a24.bin
df5b868c20af7085f9eaf08b9e04225361f7b73c9d2cbf70815b056515e4ca0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 10280 bytes
font_02_sfnt_off00013134.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13134 16792 bytes