Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f0d59950009310…

MALICIOUS

PDF

68.9 KB Created: 2021-09-09 11:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a7916276198fe2465c4995be8a4f2cea SHA-1: 9d82fb6d51337e591c52dbd0b982f578588a65a2 SHA-256: 04f0d5995000931016d95a1392e842823c4e4dc31ae329c5a2f3e9cdcd8233a5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 1 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://synerhu.ru/uplcv?utm_term=scrolling+text+android+studio PDF link annotation
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/zukudokapake.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/33481682381.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/jajikakenajozinifa.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161378041ea891---23818211771.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210906132003.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/1685730440.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/merafamefenudadafafelepe.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/89567166328.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613083100ec6e---sefunadijexetobobidid.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/74252925421.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c11caba75b1ae3986ebc76a47141dd93/55454913162.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/sezar.pdfIn PDF document text
    • https://tsegypt.com/file/81561903148.pdfIn PDF document text
    • https://protrialse.eu/files/files/palelabigujelopujevogore.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/retawok.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/fipusenedafib.pdfIn PDF document text
    • https://goodline.by/userfiles/file/97410018330.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/73765756925.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/54144332072.pdfIn PDF document text
    • http://one9five.com/userfiles/files/zojufowomexazotawilop.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/11061995369.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/50424393054.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0c25d69a46d90f5fc499caf35942352b/zajoxizozudiritupu.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/somarotudavexigez.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/22757676518.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/sapoxena.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_off0000b223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 10820 bytes
SHA-256: a91e1eb572fbcdde0a99283aeb5c248d1b568fa0909a96e96e8bdb8330b79004
font_02_sfnt_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 13944 bytes
SHA-256: a548bc58acb50fc739a9cd033cefa7187a19b51b41b074379a85a712a96bd1e5

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