Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b9aa5bf0e3b51b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 10:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d1088755d291c114158e34b5d4eb47f SHA-1: b793a1e17db706ca4f9a1724201e7ab27fccfbd7 SHA-256: c1b9aa5bf0e3b51bed54cafcb4f9fb58b6c88fe6f17aa15f10616b9695de4556
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinariocigliano.com/userfiles/files/75045663584.pdf In PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2a89297dba7b6760d2243ce7fb6f4232/sajawepagemosapasop.pdfIn PDF document text
    • http://teresachild.com/upload/files/towagetafazafi.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/3679735714.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/jetifovofomisedulamod.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/mavojegak.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/nimusus.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210910_11FA4EF1C2418562.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/22912319595.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139945c78403---13351296501.pdfIn PDF document text
    • http://goldmustang.ru/files/files/41934488251.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/37256804336.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/fuxikikodoluwudewaru.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/38756973482.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/21118018561.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210911224549.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/22166577478.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/jofibuvusime.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374af23e4b6---bukofi.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/mokipejufaris.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/pizato.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/3696869502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tintin+the+game+apkPDF 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_off0000cc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 10320 bytes
SHA-256: 7b14990d864b92600b873ec2551aa6f1866646d4b2ad882116147875c992c028
font_02_sfnt_off0000fb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2D 20052 bytes
SHA-256: 9eb9f58ed74b3b4ac36fd902a3917355d1b7d8390c16809d3d57c79cffa27725

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