Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d9490eff290a0c…

MALICIOUS

PDF

96.2 KB Created: 2021-09-05 08:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cfd11e195a5242b915146cdb6841eef2 SHA-1: 538357dc98460f2f6219572e05dcde18a882b669 SHA-256: d5d9490eff290a0cc22f6732625f82706ae569be339a73a3ac86522a50063c03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs, many hosted on compromised WordPress sites, suggest a link farm designed to redirect users to malicious content. The file's structure and the presence of external links indicate it's likely used in a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=themes+in+animal+farm+pdf PDF link annotation
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6e17619cbdac3107578a257edd74a88f/guvejavilizirizepopute.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/94816847406.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/44496632798.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/bisedolirenuvowixi.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/53936752367.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/d14di8u14557gsdrgq8q82i1bl/17802095320.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/70448042358.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa84e0c3cee---82633774182.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968fde58d67---bejomiwunevejaxazesa.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/13ea05995a13f5af31becc4d3425f29d/74556826022.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/bfc4cb45e1b1545d8fecc0931ab8a61f/bimujodawozizutolu.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/46d2b2bff8d2ee4ac4e85c8d1d9da4d2/jelawedalijogomedatuz.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/ludokuxebilonaweruwak.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/a0qrj4vlc0h6bpbdmibco97bku/89584384424.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/54806841843.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607242fdcee00---31626636426.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ccaa368ec---xikadavewevabirevodazupag.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/40d4b29a2a00810a14b228b6f53a7484/kugalujumewa.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/510d04f1a6uimat6ks049teiu2/zizijunaninawu.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/08/11/95485263958.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/pikatokuvadox.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0312190cabda4f62ae9bfe938f125f58/zifepe.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_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 18012 bytes
SHA-256: 866f2e0aa319d2b034115751fd0128e83687387315a451ccda9ccbddc5b9f1c7
font_01_sfnt_off000143a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBB 10508 bytes
SHA-256: 80cdb4c6e956843104f7817e7767b12b0511bed3606f59c9565ac26f452c76d7

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