Malicious PDF — malware analysis report

Static analysis result for SHA-256 0313ef9b158554f8…

MALICIOUS

PDF

97.9 KB Created: 2021-06-28 10:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f87fe85d36468e68be96d895331f8962 SHA-1: 45ef68ba033cb8dfee188b01f5d6c430f9a6d26e SHA-256: 0313ef9b158554f893f808093a8145785d22dbebe44ecfd249871f79c1ac458f
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users. The document body is unreadable, but the heuristics indicate a malicious intent to host or link to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://aronabritcan.com/userfiles/file/47081656605.pdf In PDF document text
    • http://msamerica.net/clients/873634/File/92722151605.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a55e8945ed3---jepewamewigadelowobazile.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/tovukesubudumo.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f3fd6e53---44455057121.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xubiriwejijoxuvirafu.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/a8782795c052be30707723f89d9315bf/lofelizuru.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/sfuab1qq6e70bl1jrsasnpjmr6/71440847828.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/48321951800.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/6cad957bcfab0c0c650000722a3c1b35/zimij.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/melabotemeladunor.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9rpkb7ashqgda9g4hkqe0fuo80/kogefidever.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af3817b0cee---11657223724.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5f0927552fddee4855343fd02dd493b5/kofalavajitilevamaxubax.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/69692657447.pdfIn PDF document text
    • http://chsjackets75.com/clients/a/ae/ae1e0d6431e3080ad3d3eb1024a27f31/File/dutipepajigugiwobixi.pdfIn PDF document text
    • https://digireg.dk/upload/67295831173.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b36561826119685abbf8c512d57331ad/62752969529.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///98658168320.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1f30a2a2e3a26b488f33a3050faf5996/tozawitikowut.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e572070cd---84689571801.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7894894ffa---12907632752.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/44439207622.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa7a1e4d3---27626872989.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cc8f371af77fc2e47bf63718a2388f43/wurefuwub.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/64bqe0u7mlgq99luvrehm8lr31/jeravaminesazitubiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lacie+network+assistant+manualPDF link annotation
    • 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_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001315e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315E 10624 bytes
SHA-256: 77a79b492ad367119f4f12433bf7b84a88d62dfd0323a89446ea9d87d5a12cad
font_02_sfnt_off000149c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C1 18532 bytes
SHA-256: e360d36a78a6dad44ccc80f6749094637b14d112dab8489423b047068aeb892a