Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab7f765e4ae2b65…

MALICIOUS

PDF

96.7 KB Created: 2021-06-26 16:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea18bd7d1b8f6f218f2265be70eac9f3 SHA-1: 100956a5cbec15a17f9ad32c686679125152d93c SHA-256: fab7f765e4ae2b658f03356aef09ffe728abdb99a299217a2341e7a92ffb6d1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These links likely serve as redirects to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://nomylo.ru/uplcv?utm_term=example+for+linear+function
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072155054f0d---xegexezutogeb.pdf
    • https://ruiguoex.com/upfile/files/2021/06/24/jifixeriburodimufakew.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160965b37a6de9---jakenenipuzuxikitasa.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/67637173851.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3053b4863---kiwal.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac546f0c82e---64714922867.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608206abef143---99241012470.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/319dfecf60112d82f8e8b2205d18d21a/mokakevagekexinareja.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/i9k88jood30tq58b01jinauot7/parabifafegufokepalifefa.pdf
    • https://fnb-concepts.com/images/uploads/files/40147647293.pdf
    • https://serka.com/serka/upload/files/84868135282.pdf
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/rizowukavimanup.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5eotds82qeoju0v01np46oatmu/74081258084.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ekbn7jti94gjaokjrrd5otm304/jisam.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d25ca6ab861d152ba37890aa078bf785/pemugevexekanapezi.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0fe890000---65600123630.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b323592b63e35cdea04a7edbdf7f080c/lifez.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4mjm5bm68emrsu76lh6gerdtsa/54203387955.pdf
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/55833851389.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/n34m77d1vb14intaabqqoq1f2b/datavogizapilojurerigi.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//tikovedikavusixi.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7d2316ffaeeef98c190d7eba70b1465d/bogefigolosukijowezimawi.pdf
    • http://w-f-l.de/user_img/file/85659177662.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/ed1f59285830a7555dd5cbb3cebb0684/bewozizi.pdf
    • 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_off0001151e.bin
d2507e5091043d48c96fc8a16e3dab3c1d8953c49588c6faa7c528255303b190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1151E 10656 bytes
font_01_sfnt_off00012d77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 16792 bytes
font_02_sfnt_off00014589.bin
05e5934b5aef1053e0c5a7739e31f6f1d9fbccda7dbd2ff6dcec77968cde5e20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14589 18092 bytes

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