Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad77e1437e854ef7…

MALICIOUS

PDF

87.5 KB Created: 2021-08-19 19:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dfce04d3a07961fba5bc20d99c5ed2cb SHA-1: bbc25158ce9fa02f4a8ad72a2306bd819415bc64 SHA-256: ad77e1437e854ef71543dc90d45741bd9685333ce4f62283fb16ebf46a201a55
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and link farm patterns, suggesting its primary purpose is to redirect users to potentially malicious websites. The presence of compromised CMS upload links further indicates a pattern of hosting malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://inwebjor.ru/uplcv?utm_term=samsung+galaxy+tab+charger+port+replacement PDF link annotation
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738cada978d---58096852631.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/26731959962.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/j0l0rp2qbvami6kj16es3thv7l/sitirurusuxawefukujuza.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/tuzaxubikixesak.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/nabifulabuputulogid.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d194a4b95d---jigema.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/91254626452.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/67625307891.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/rewategowalas.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/gisobebawosifexaji.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe28baa768---65410159135.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6fd3d0b24d---83672327381.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ajfbdveor2284j76vko71rqiid/58761782978.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ef00bvnqlqqpkq4n045lndlkcm/keraxitopotubo.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/megopazabikevezogo.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/43168716093.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4cd8e35ca---82147997301.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/jivijipibidununoxu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/xomefeg.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/17335217483.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021073003023632.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/81146512514.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/80696501797.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/81611198753.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/ninenigisokavadukixe.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/5s4jes9erqu24sh8dvso4n1cpb/96016112490.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_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 17240 bytes
SHA-256: 1e997e1ec249c9530cd24173d8867c14c5eb1b42adf97baa23cccdcb44d91c89
font_01_sfnt_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F9 11260 bytes
SHA-256: f6cf1b976d7cbc7908ed369cbffbbb0719be74b3a4671b7681b3ffb3e853e724