Malicious PDF — malware analysis report

Static analysis result for SHA-256 78037d3b8c3e04b4…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 01:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9ec983c80e0e02e18f1d7fa8590e0b60 SHA-1: 291338fff9fec674a38881d0931ad0f8bff83a28 SHA-256: 78037d3b8c3e04b4bfb2690d69699745c8d3a0dfb63ca8f71dbcd656100bf055
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially harmful content. The presence of multiple external URIs and link farm indicators suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=tomato+vpn+apk+free+download PDF link annotation
    • https://auto826.com/uploads/files/68490173785.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/wetaxotisadajixipek.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/77660778998.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/suburizopoxosofomewal.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/kuburekewunakaki.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/rexudobifojovaxonetu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615122f302c6b---57276562022.pdfIn PDF document text
    • http://gysanya.com/upload/file/210923075554044229ug8gs99ljfb9.pdfIn PDF document text
    • http://artospace.com/pics/file/nupakimavasemanovalo.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/61464270474.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/39808581637.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/xuzefajekedemivad.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/81974472108.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/65327716809.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/tutibutomijobixar.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/bikonumisapijideg.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/getezusuxob.pdfIn PDF document text
    • http://specialcats.nl/media/files/60026895276.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/81180574972.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/kuxafizexabojis.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/duxagemoberenubudalif.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ec121dec80e53cbe6bd8331a494dede1/nevejisugizutupipisemeg.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a032508a3---rezubi.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/98334046467.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/56591727820.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_off0000b321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB321 10604 bytes
SHA-256: 4afe9e8db8efaa59bb5262c3779e01dd3d1464dfac714ac4f45f90e903a02d33
font_01_sfnt_off0000cb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 14716 bytes
SHA-256: 530776f17bf44579e67488e2cbc3beb2a4bdb96a9cdbf4b9ceab63c53a418469

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