Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e8e523537b140a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 12:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f0755b4b4a1cee19c4475de215cd34b SHA-1: 0f18e621bd0310b2a1d126f21e6a28501da554a0 SHA-256: 69e8e523537b140a2f74728a420e312b6751d56b4479c64ae18959d62e3ffa36
176 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The document's structure and embedded URLs suggest an attempt to lure users into clicking through to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://graviroz.hu/ckfinder/userfiles/files/bosolejulesazajudun.pdf In PDF document text
    • http://maimungkorn.com/UserFiles/file/fumav.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/kokapatifiwusiw.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/beluli.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/badugun.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/45583517595.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/kaviragizavubekixulekagor.pdfIn PDF document text
    • http://fruitsad.pl/images/file/2726017820.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210909123131.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/revijibigosumetinanijefu.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/81269545760.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8e325a884c20cb527ad2dc9b2baa8ae/ranolowisowubol.pdfIn PDF document text
    • http://c-amc.com/upload/files/85715385021.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/bosiwexujugabubuluxusakoj.pdfIn PDF document text
    • https://websbag.com/uploads/files/1896521931.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136785e68f9b---ranakum.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/vopixubekajuzutezozofos.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210904061553.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/84709842561.pdfIn PDF document text
    • https://2winit.com/Files/files/92739583912.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/lidukadilumaje.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e37b53216d8656e585bce40d018360b5/37520591736.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/74135541969.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/tiwokosojipijajaxefozukek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=beyblade+rare+qr+codesPDF 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://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_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 10524 bytes
SHA-256: 61ddd4d50473a6aa95678ff4d393fccfaf85466b48bfd0c712fbfe263779c6c5
font_02_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 17664 bytes
SHA-256: ef38701f87a3612b73813530f9964940f5f899ff95e765694ea9290e52ea5e6a

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