Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35fffa722c1b5e0…

MALICIOUS

PDF

68.3 KB Created: 2021-09-12 23:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc4eb3324de5964d808648f8f1bc6dc0 SHA-1: d46275e82d92c0a3c0258e84538bc51ed8e6e164 SHA-256: f35fffa722c1b5e01c29ed89cb456188951cc610e29441f961f81fac1535156a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide clickable links. Multiple heuristics indicate it's a link farm pointing to compromised CMS uploads and disposable hosting, with one URL specifically mentioning 'show instagram private profile' as a lure. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://irlanc.ru/uplcv?utm_term=show+instagram+private+profile PDF link annotation
    • http://sbcnepal.com/images/file/vesoxawasulaneru.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/somivejebademulisame.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f37cfdb2fa5d1d1e192e45f0c1c91e4/27083879197.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/16318732310.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/bonajuxoda.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318cc3d2391---fukexugo.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2767202119.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/varipawaja.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/tasivuxus.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/90515228265.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///6904929129.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/83522073826.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/sosowufulomap.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-11/images/files/xaxabudimo.pdfIn PDF document text
    • http://blccy.com/userfiles/files/86954295578.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133255d52a70---jifuxop.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/63606957510.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/pixewipexurobop.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d0ed6dc19---juremerifanewasufe.pdfIn PDF document text
    • http://garderoba.sk/images/_file/wodamuxamajo.pdfIn PDF document text
    • https://htchninc.com/d/files/lajedesipemibe.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/xivevibatekakegitebubopon.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/93559794755.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_off0000af37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC749 14060 bytes
SHA-256: bc4e210617284f3248ea0c6f1daa7a89c86aebd06911c707dfa5ff4a11eefbb9
font_02_sfnt_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 11032 bytes
SHA-256: 45d41c5c01551a897f6ebd1e605e4d6d726d82c8320414f2d1e3187982cbc42e

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