Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff555968653737f…

MALICIOUS

PDF

85.0 KB Created: 2021-06-27 18:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64ebc33f4266e29cab2483bc3046868d SHA-1: 27ced7e02c614afce6f99cbf909dc23acadd1e4a SHA-256: bff555968653737f630f42e1b676008d7748eb4e172d605acce8db7bfe1a1ff8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ca31d3129---27432660049.pdf
    • https://landbondcorten.com/attachment/file/30cf7770614e547b1d6f8ee7b074d0ac.pdf
    • http://helloshoppingnepal.com/userfiles/file/dopudosikit.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/64e4ff1ff2ebb797251b6ee94993ac5c/wixoxikeme.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/58156503511.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/055dd957b217ab23fdd1e2a91fdb6567/lipelafemulamepurulebefoz.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/d0e09815ad8f2d8de3300a60f15741f7/95119696188.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f307090f---59763637129.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2fd04ddb6---bufivaxaxalol.pdf
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/lexidiwupowiwavidefowi.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e3579c851---25751167965.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160919ad825444---48352471074.pdf
    • http://animalscipublisher.com/files/upfiles/file/33612910795.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/bfcdf831bf7aba6227e211ba429b602a/23179805210.pdf
    • https://gamedunyasi.com/calisma2/files/uploads/8369321599.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160898c68e74ed---digotunekojevowovazutilu.pdf
    • https://energooptima.hu/upload/File/33911296909.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/23810052024.pdf
    • https://cakenepal.com/userfiles/file/24668849155.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/eaf3fbd43bcb71715fd87b9cb282202e/35213388536.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/6f9b92057fcebaac59c06f9f1ed31542/90466995813.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/87444184720.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096ee91c060b---lilapawi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+teleport+in+minecraft+on+xbox
    • https://mediaget.com/userfiles/files/3796641119.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_off0000e736.bin
02ec7850ecd4286b2c35a64dde9173abc5a46cec652bff0578b14941e458bd7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 10792 bytes
font_01_sfnt_off0000ffe0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 16792 bytes
font_02_sfnt_off000117f2.bin
5305ce4a6533ea9ec5832537fc072240012329e524af6978cba1f969ffe76dfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 17236 bytes