Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56b125c259ed5e3…

MALICIOUS

PDF

97.7 KB Created: 2021-08-01 05:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2b4ac504a3b8dae6b3ca9d3f1653f84 SHA-1: d28a2670b8a46b81e50a12a2b0b1ad7b65f1a802 SHA-256: b56b125c259ed5e3d0f9710d7e67e7dd59045fc1632406ac27e643ca358eef95
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/q94ut8d9ui8vuniq55k1pn69vo/masapajagasabenev.pdf
    • http://www.kymkarajok.net/tiedostot/files/dobupotapu.pdf
    • http://inistor.com/ufiles/files/jowewovovaripadil.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2bc3d0b3b6746e673efb34183e98ce3e/11721894863.pdf
    • http://morecoredesign.com/images/imageUps/files/90486699792.pdf
    • https://anmoul.com/userfiles/file/50530158249.pdf
    • https://guapa2.com/admin/fck/file/fotarovukomid.pdf
    • http://cristal-in.fr/userfiles/file/34938140805.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/053016ed56ea61c4bc71efd206c86791/kusemimojijonetasufosud.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf464646e---vazusofebo.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b48e420437f---pudisibujixuxigagibux.pdf
    • http://novussiteyonetimi.com/uploads/file/22491704874.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/311tlrpa9anf635d1beqfcln93/52564315521.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f123afe721e---gidoxexakijuboxonefasekeg.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ef16e0d6e---29221092706.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/rtuu1je05hhjcmkou1u7593ofh/raludadovomanamigigozesos.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vopvgi2ua55lpndtvlgfl6esno/dexalubazuzomu.pdf
    • http://kojeneckezbozi.eu/userfiles/file/batowigibaz.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d35905eed4cbceb65e8eacbcf6a7e17c/56023862200.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/i3puua65hkeugjuvf8gqll4us7/50297197578.pdf
    • http://chretkinia.pl/userfiles/file/mebaxukukitajopoxozopato.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/27106e3bf90824dd006d186635dd81de/43368500365.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/darsa05205l40ba72orovqi08o/kebixitokimifep.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e6526f78f165f391515556819cf3e3b/fovekomuti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=la+bella+ceci+y+el+imprudente+capitulo+35
    • 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_off0001132c.bin
02f977f94a4e0473cfbea0960e405680c22370832b2e6d69bb1c2856174078d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 19124 bytes
font_01_sfnt_off000143de.bin
746a17ca9933f7f04a76f7eae006bb41bd3867ed632463d2eae2f0fbc11f36eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x143DE 11124 bytes
font_02_sfnt_off00015d9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9C 16792 bytes