Malicious PDF — malware analysis report

Static analysis result for SHA-256 145cac0353b7cddd…

MALICIOUS

PDF

89.9 KB Created: 2021-07-05 03:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce8763143eb43e2dbacc0bfcd93e8f20 SHA-1: f10cc42f036a18ee83f18af39654d573703750b8 SHA-256: 145cac0353b7cdddd5f196ee7c44a6709ff6faca5b3e70007d7acf5ef7006ded
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609813cb3a7fe---kolebidikupaxepaxuxupize.pdf
    • http://yourtruck.be/upload/ckeditor/file/jokixunewevijupegilek.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607491c724daa---68283595913.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/04131937626ab86255af3d06ac9a5165/levanitifupiso.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/4aaaf2ee79a3e3aa06e83174e8bfc991/36815292276.pdf
    • http://shinex-auto.com/userfiles/file/muromufepon.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd019a56c36---rigelemapikojijas.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/o93nlq6p2516jlatfm68hek9rr/debuluxer.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e22f55a808c---sidawan.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7675340d96be3b00eac86985660e066f/51215514128.pdf
    • http://wannawwannie.pl/userfiles/file/getebaf.pdf
    • http://lycee-elm.org/userfiles/file/20856568047.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073be2d95752---61239491074.pdf
    • http://cokhibaosang.com/media/ftp/file/26409898477.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1bf71c660---kivufopiwimedifun.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1r0dd2o9joj7sir0r71faahva/88823867484.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5728334b---48920583927.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210625212424.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210703_35838E9A1CDC1A2F.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba3f2a29d4---pafadakibumibibufefefam.pdf
    • http://energy-labels.com/userfiles/file/lasemababatanesepoxoj.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ab47a35b4---82001155764.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/80hlo36g6ai4hvnb08bu1nptc5/19242918920.pdf
    • https://soudurelauziere.com/upload/editor/file/2889630716.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/46a9a0271fdb159579bf8a07e812fbf8/77110476892.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tissues+class+9+mcq+questions+with+answers
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a1.bin
5777105df5abc3630494682b1fef5f039a4727f0d6ca4b474cc9577d21150e33
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 16344 bytes
font_01_sfnt_off00011200.bin
0b5448c6de0ed0f116d2c680d9cb6f47e90a51602807fce3603fd82f599d96d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11200 16376 bytes
font_02_sfnt_off000127f5.bin
766e0cc388d2e662573569ed428e165cdb88e2e48d996220461cc7a9e76b4d36
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F5 10956 bytes
font_03_sfnt_off0001414d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1414D 16792 bytes