Malicious PDF — malware analysis report

Static analysis result for SHA-256 166d49ececc966ce…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 07:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b3d3ee5b6499a51eb1e0f067b261a92 SHA-1: 1ae1b61bb6be82d8179a86feac73d947e4ab2b42 SHA-256: 166d49ececc966ce4022bfbf558effdb57558ac0807e17d81962de4c8403dac2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=cheat+harvest+moon+android PDF link annotation
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/midamap.pdfIn PDF document text
    • http://amkchem.com/upload/files/89423248434.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/goxopokuzo.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/53844730269.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/wibujuwezoguxekelukaza.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/serazo.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/bisif.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/8477br7nk38es7jgia04o29lt6/10596369880.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/vatitog.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c67419142---volako.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/gabubaganowidu.pdfIn PDF document text
    • https://htchninc.com/d/files/namejo.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/mijotinafuguliz.pdfIn PDF document text
    • https://sanagustin.cl/files/79374120512.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/fewikedijezudivu.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/2576200881.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/remugufaxawegirore.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/teroborevebidupumogimoda.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c81c46e48---57115277496.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/82095126520.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/60548718161.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/5865000954.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210909_F57C18F940FEDBED.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/xuvor.pdfIn PDF document text
    • 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://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 10564 bytes
SHA-256: 072c4a3700337ef7064bea85d421c8b61b799c7552696f7a3f6ee1e94fcfd04f
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 18668 bytes
SHA-256: 2ed7b43b86ad6055d62a3dc1e1985cc2a2592e3cb47ff772476e714bcc1caa86
font_02_sfnt_off0001270e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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