Malicious PDF — malware analysis report

Static analysis result for SHA-256 3daf698721c9b00b…

MALICIOUS

PDF

84.1 KB Created: 2021-08-30 13:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24abbb5a65d52d2ca5c7b04a755cd9f2 SHA-1: 28aa94d09e3a3a0029333b0fc24177ef25fd56ba SHA-256: 3daf698721c9b00be1adf5724af7ec1e82ed5ffd409603c07b1672f344466cf1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to distribute or host malicious content. The PDF's structure and the presence of multiple external URIs strongly indicate it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/nefimejudowodixo.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/26b51295672868625aaae5bbe901b644/fagivoxumakubufon.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/08c33b25e8035d7c0e43a1633bbaaf98/9536321859.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/18087f5939216872de8c394a485f5fcb/tominen.pdf
    • http://siciny.pl/userfiles/file/87466334869.pdf
    • https://krzczonowice.pl/gfx/file/zizonawirogaw.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607249929c1e3---najojiwigujume.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b68088013cc---vabovavaxetukalopoxebij.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59943be330---43522363978.pdf
    • http://resetimpianti.it/reset/public/file/lifuripovugapofovim.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/81291a8b1aaee9cf17ae174c80008c4c/siratakuronazegop.pdf
    • http://poiskvod.ru/images/file/55107943811.pdf
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/daxekexubudajanepoza.pdf
    • https://civilkontroll.hu/uploads/file/62440531320.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/82f21a871343b97a8c63419eccd51c3d/59396560774.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160e40f2b67399---janukamopetudavenorowezi.pdf
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/16827105434.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c8d23447436be42b0e3d276daef242c4/86912486449.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82e4d1287f---pibaresasaruno.pdf
    • http://noithattamphuong.com/upload/files/pipuwunolefozem.pdf
    • https://cheeselicious.net/UserFiles/file/14033276879.pdf
    • https://aimhc.com/userfiles/file/47271922574.pdf
    • https://birudongker.com/contents//files/87656628468.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=country+blues+scale
    • 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_off0000dff6.bin
f467f5b5ba5cbe8b89a82cb6f7d96ca294026ed57cdc97fc2639a95e8a2ee44b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 10516 bytes
font_01_sfnt_off0000f82c.bin
9b6ea1d287d82230f668264f59054adb56e8953fdfbff4ffaf22905cea9091fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 18884 bytes
font_02_sfnt_off000129d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D2 16792 bytes