Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1885b26e543475…

MALICIOUS

PDF

97.2 KB Created: 2021-08-14 08:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd0f58a413ea8b2a24a2685e57a9a85a SHA-1: dc5813afbac87618b5e23000dcd98d6502706ffa SHA-256: bc1885b26e54347560bbefbb7b5d8029571d7daba8b7fd68f037f77cf00a5d3d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://activesolutionelectric.com/images/file/domutovijujuwis.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16083d5020234b---zetawoseroginagupo.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/11ebc697161c371efba5e1f1a4e22e32/25113715787.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/53453202912.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf32adef9c2---dogemonuxonoposaferezebo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2553bf6a16ce914e985983d06e29114c/96030221320.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210620185257.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/zituguvezusizamimoko.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b552228e03---xonurusiwe.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891e1aa6100---gozifimadesutosepukages.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/nuvebepi.pdfIn PDF document text
    • https://loctra.net/userfiles/file/zexemeliwifu.pdfIn PDF document text
    • http://tulga.ru/editor/files/xadidajokulewiwowitanalo.pdfIn PDF document text
    • https://songhong.info/userfiles/file/sekexaxeg.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160907940809f5---18544787525.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/megasit.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/76273157828.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/nesurasupu.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/jumixozaval.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/913bfe7f25b74c97ef188ba29e7d69a6/tubifejuxe.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/wegibajiz.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/fifanazijimuzo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3904bbe376---jabonupulofifapudok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=doctor+house+capitulo+6+en+espa%C3%B1ol+latino+temporada+1PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 11304 bytes
SHA-256: d2adcba84974b709925f20b91fa18fe4f3b59a6321c9b774203d5d8edab8d63e
font_01_sfnt_off0001313d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001494f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494F 18984 bytes
SHA-256: 32d7ad90306e0d57d0808787124f7a1555a6477f97acdf38489eb2b55c63176e