Malicious PDF — malware analysis report

Static analysis result for SHA-256 6523c5fe5a9706de…

MALICIOUS

PDF

74.1 KB Created: 2021-09-02 21:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad95b0255cb96ebceef3fbe16c4efe45 SHA-1: 1af61fc9b83da1abc1e519e9dd65831ae1ac8658 SHA-256: 6523c5fe5a9706de2c156574e1cd08bb5395274018679b22bab76d53fa21cc5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF likely serving as a lure to download further payloads or redirect to phishing sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=yamaha+psr+400+manual+download PDF link annotation
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3cfc348f---99579026874.pdfIn PDF document text
    • https://dm288.rs/slicice/file/tatitameruka.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/62551318767.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/29781749443.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071de4fce094---vobovadumalodonabafefomug.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/gabipomagurakoxaxik.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/wikizeg.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/72584890252.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/wimasamaxopelapegewibumaz.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/bagififilomuwivusib.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/dewivosuwadubajubola.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/44783821195.pdfIn PDF document text
    • http://esistore.com/userfiles/file/rapusibozotefagefelexow.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d139b2ebd---lufomevopigutokikokejabu.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/biroseginozafebefuba.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/23271140904.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/votit.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e250480983---65018350530.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/taf4gkgcl1ricmm4evu33830q6/pigajirufifejuvolevexen.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/42093348092.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/91224860623.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/mivetojix.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/78a2aaed51f8973113ddc3212fa5a42f/padunuxo.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/80804009295.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0c3adab64b169be48e627e2e10ad4733/71034248400.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_off0000bb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 17664 bytes
SHA-256: e9ea046de80bd82ed8d1ed22ca006dcf6445a168b70987589c65b9459252bd7e
font_02_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 10704 bytes
SHA-256: fad0578366995698388f87710964ab265f68b3ba9e7635f7f85de6e58e06995a

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