Malicious PDF — malware analysis report

Static analysis result for SHA-256 22281fd6e7e7d5b1…

MALICIOUS

PDF

88.1 KB Created: 2021-09-03 14:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3cda7ea6c2f201c2a0cfa8b5e5f4bb1c SHA-1: 385b520970babd3f3f2f73a3137b3c59013c79c1 SHA-256: 22281fd6e7e7d5b1d8da8be50160a199cc59b198bc51f259c6eb6586ef557837
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it is used as a lure to redirect users to potentially malicious websites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=teknik+rekayasa+genetika+pdf PDF link annotation
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/bd7a0eef97c05721b51957605d846b6b/98175178828.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/24/file/timeduje.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/3db085e89eeec1dd2b097b89f0791639/23971304257.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608686426e17e---tefakep.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021082415033973499.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b6fcd934---jimijudilejikutidigibulu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160945ec8bf2c3---69548948406.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f48cf6cdd3e---fovibujitalozifafuvuxeda.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/dikepudotup.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/66437121712.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/l4rmlrhsqs2fvikg1c6g0bq28n/7858357345.pdfIn PDF document text
    • http://kasargod.net/uploads/file/31223144488.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/xasonowilaguxejadep.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/dumidefodivixovisu.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/28568850069.pdfIn PDF document text
    • http://alkanboya.com/files/file///99306128865.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/96082435400.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/24496581407.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/591433f081bc36ec865e418f4e0c4d55/61443233284.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/wedovusovemejosilu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d49d758ed190fccca37467b0957dc990/87025357860.pdfIn PDF document text
    • http://meskerjager.nl/media/files/togadotegivofukufukudibo.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/zigasodakufesanepi.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_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 10676 bytes
SHA-256: 1d7cb3ffd5a92eee8986b98eda08beab3687b82578d3afcf65444bf6729ebb11
font_01_sfnt_off00010baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 18148 bytes
SHA-256: c01c68189f0446c2e64acc71e0a26b17a53441d5cfd1edf4b70b039769c3e4af

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