Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72d95d3a8856da2…

MALICIOUS

PDF

86.9 KB Created: 2021-09-20 03:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 14329741051f0fb0b81af4247880a5f6 SHA-1: 1d9e406168f69f97b90763a08e1c5f1dea94ff8c SHA-256: a72d95d3a8856da2d4227af804a745c84fb936c3a7d984ef04c4baee5af89003
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://auto-rad.pl/userfiles/file/zaruvagibuwezedaxo.pdf In PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/diwawaporupebuzo.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/civp4ffuhkudnr9mpv5cuvaq2r/7648909192.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369f97a1a44---jukawonodesodazenozuzafi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4c5362689373e0472faf792dd5e2f9f1/kojeziroromotolifesizuja.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/pasotaniwetoxolagokes.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/5542448616.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/97359517576.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/nenuvisidupewolukiwur.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/90316873987.pdfIn PDF document text
    • http://poliinc.com/upload/files/laxixewegizumigirogu.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/sigefagirazunu.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/pitaxetuk.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/zonedewurasopefamatemen.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/19515139821.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/9644550648.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/nezuku.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/welajaxokuzapoput.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/62703397205.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/52372022687.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/ribitirexix.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/katinabutowofubaviludowap.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630915577/file/99759164508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=free+video+editing+software+for+32+bit+windows+7PDF 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_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 17808 bytes
SHA-256: 4fe15d84b50f55caf4e07c219273e88a210940b68150f194bc7f2afa735fbd41
font_01_sfnt_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13410 11096 bytes
SHA-256: 31f69dad487479335d456bce39cfb0486821ae915c5cf1a80ff4a5e3939fbf45

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