Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5a148fbab307ad…

MALICIOUS

PDF

79.3 KB Created: 2021-08-28 21:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c88f6430bb64b9c516643601bf9d69e5 SHA-1: ecef6b3f9949331255334eaee826acd26aab1679 SHA-256: 6a5a148fbab307ad795c58d83fd4dbf2536cd93b73faf384d5cc262271516f15
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Numerous URLs were extracted, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092f9ff03c07---vopijorozelimoxorupoviw.pdf In PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/78d20f5239008986f1fa5a9d336d1e0e/58820073569.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/42242681007.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/xejiperemujidawavoxojono.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/f5d8169a6fed3dce7bbdf85a97659476/31480598536.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/29538655008.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9017a7940041e0d146557693fa9525f6/beligorone.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/gebepedorataruko.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5faa33dff36d0ddc15b706a0f06234b4/15203530220.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/325233845559af45f3510dba57df3151/48770349388.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/84c586ca1bd6a58866f963de5f8fdd4b/vigonatebor.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/gisorujuxalitaginodapeg.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7454b80b3f---toxox.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/zexonomume.pdfIn PDF document text
    • http://slsnn.ru/content/files/41451044790.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/taxavo.pdfIn PDF document text
    • http://arlingtonhigh1959.com/clients/863184/File/73754432641.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/59090039844.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/62722314203.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/64591620848.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5557d875e9---87961181089.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7bh0k0mml6kvdbqau77g6msl11/naregoxugumul.pdfIn PDF document text
    • https://ms01bet.net/contents//files/82895606913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lateral+leads+ecgPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 10188 bytes
SHA-256: 6309dd040f9b886f0785e92fb1b598429c1b68d434f6842dfbb83f686fda9d6f
font_02_sfnt_off000101fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FB 17428 bytes
SHA-256: 43a64755f16a6892a4ec58dff66c44e4d52e865dda7727192e173f750894a4d7

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