Malicious PDF — malware analysis report

Static analysis result for SHA-256 568851c8ca61760b…

MALICIOUS

PDF

82.9 KB Created: 2021-07-17 14:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a21b7d5ea8cbe89abd9f0e64bbbbaa6 SHA-1: 8c97a57377532143adac480223f5c29b26a51b74 SHA-256: 568851c8ca61760b9302454df6989ae833611af8a1160567a97a69d2b1ad03c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The presence of a link farm suggests an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://x-software.cz/data/file/pugudeturop.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75e6dee34d---4279878689.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/4t5mjt4iima71t52pepj4pcfaj/37716889066.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4660b88b2171bd21c0eb4d27a5a19a7f/12590775066.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607731ae5c4ce---19060173091.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3e6efce3889f32aac2ff56040642e157/34668184554.pdf
    • http://cnc-soustruzeni.cz/files/file/miwunu.pdf
    • https://organicfertilizerproduction.com/d/files/kelosiviv.pdf
    • https://hopadive.cz/ckfinder/userfiles/files/dunaxelujuxes.pdf
    • http://paoladebenedetti.eu/userfiles/files/23703054230.pdf
    • http://stavclearing.ru/upload/files/vaxofefetitabofizupu.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe39f32994---zolawevenetogeminovize.pdf
    • http://indyztyle.com/ckfinder/userfiles/files/70321387593.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b203121e243---30904637743.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/97643a856a5858be192823b34ca38e76/deluzitawiwobojo.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6pcobkkgngefb4glvic29ch7a6/funumojimunaxanaboxifuge.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8003db63f---53715846336.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/c4fd10e5800101e95768db03c92d0a21/mikuriratuduwonemusi.pdf
    • http://italiangreyhound.pl/img1/userfiles/file/22053921214.pdf
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/12679071326.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3694f459---59140324352.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/24053a594550dde5a0dcc1558d2b7c86/femujiribodikeg.pdf
    • http://bagiez.com/userfiles/file/mozemibajifo.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592e4297e1---13086010625.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=lagu+im+only+one+call+away
    • 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_off0000e0a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 16792 bytes
font_01_sfnt_off0000f8b9.bin
c41d266d5cac165d34e683251584f47fa8459622d22acee6f66a8125812c0447
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 10464 bytes
font_02_sfnt_off0001107b.bin
4226afc47fd317959f506bfae96a250ddfe11c011688776c3c71905e32ac3e1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 16912 bytes