Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cfeaa48ca58d0b…

MALICIOUS

PDF

90.6 KB Created: 2021-08-14 12:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 05f482009a6c66cd8ade360fab0924df SHA-1: 90bf013705a27895dc0eab8a387fc3f5d67fc92d SHA-256: f9cfeaa48ca58d0b25a7562866157288879386ab7525db28d4c87e28d04b76b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF is a link farm hosted on disposable or compromised domains, designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=what+is+the+oldest+history+in+the+world PDF link annotation
    • https://cambodiaangkorhomestay.com/userfiles/file/misimeziretoxaf.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607627fcf2846---37250108965.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d67853605f9de70d1520eacac3aeb094/najutoduxerilanul.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pafutemolawevobolunujurav.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de2e0c98966---jibalifarega.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f20e3d0e6---sosibigivuzogino.pdfIn PDF document text
    • https://seikico.net/img-tym/files/jifizatuzifunebovezev.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953624bd149---77753512044.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/gufega.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/dd8e80d164fa955be14d6631dd69e86e/goxixoxesozalumusewumut.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f77ed46d0f---94399198396.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/25372807025.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/53bec112ebd03951c53f493e9f8a0b81/46321350892.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/lexatas.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/64511622717.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/7039888625.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb06c268d---2237847349.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/niget.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/lqgbtv9in0i3pesepjpo08n4sr/68045895325.pdfIn PDF document text
    • http://rafaelokazakov.com/file/12305286012.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/baxepaba.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080124096de3---malafelozolex.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/54174178396.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/safelesog.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca64830744---68873198072.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_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 10540 bytes
SHA-256: d644435efcb7d65ec42309a356a1ae2a9b28e03c17eb7e5ba763615d5987355e
font_01_sfnt_off00011860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13072 17160 bytes
SHA-256: ce965df3b4e97d30ec722e3173fee5bf316ffe00273838733489de1f1e759414

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