Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef118ebedba1f9b…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 15:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee6f4263a7d691b9245c7f8c467dd82a SHA-1: 31b6066191c623a667f687bffa74c4a2efb18d3b SHA-256: 4ef118ebedba1f9bb6dfe56cf90699a9e7536076bba5a6ef5833fbb43d8ef9d6
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to external URLs, some hosted on compromised WordPress sites or raw IP addresses. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=zee+tv+live PDF link annotation
    • http://140.121.125.49/ckfinder/userfiles/files/20210906_033411.pdfPDF link annotation
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161336ca70100d---35779658713.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/50379702774.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/28004609027.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/mgjbfsa80k5mno2drp5crrh0rr/pewiv.pdfIn PDF document text
    • http://carbontuning.ru/file/25747546984.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141983c29c4c---raxukosutaju.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/xevunatatetalawijewa.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/lefireserebefod.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/sobedojaxen.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/rasipepamigokusoxevorakik.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109110346569439.pdfIn PDF document text
    • http://afro-safari.com/upload/files/12928795826.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/64150732525.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/riwewerobifiz.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/79585310577.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/25519488788.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/74404144112.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/41791926881.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/zenis.pdfIn PDF document text
    • http://namngonviet.com/user-/files/95025438970.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/juwimujabumon.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/kujiwizib.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/nujus.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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 9476 bytes
SHA-256: d03d2ba7add5d2f9476536f229fd893f67597df6a69bb478348250fa5fa631a3
font_02_sfnt_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 17468 bytes
SHA-256: e8e86aac3d79f0fd7c46db2e9f117d0d03b63548e283355cd266873c0e265a6e

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