Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bd6005c70582da…

MALICIOUS

PDF

70.9 KB Created: 2021-09-13 01:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75edf474f243b91be05e8d8f56e4f2be SHA-1: 243ac34319aac12fec11298d67dcbf7a853cea6a SHA-256: a6bd6005c70582dadd518e04604fa511b276bd28c8b0190e3ab605ddde092766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics point towards an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=mandela+full+movie+in+tamil PDF link annotation
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8eb1dd79e53340f6ae38c8108df64e0d/25383252839.pdfIn PDF document text
    • http://bociany.sk/media/file/77153298556.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/20965340040.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/dakowixifisoxelapata.pdfIn PDF document text
    • http://telektrans.hu/editor_up/zutogozezebonelabum.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/dubazusitenobaxubuzixax.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/489706420.pdfIn PDF document text
    • https://alpinashop.bg/files/44063285393.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/13972579125.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/86738388495.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/77412300414.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/14070960045.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/54062480458.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/82797451191.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/bifakug.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac85a2b11---46607690353.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/95111866254.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/xogusikikejivaxir.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/goxenur.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/zorunafivededa.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/1pmob2ph5d80favmr4usuf05k6/figinonukiku.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba4457cbea---koxite.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/mekepurafomimuzodibafa.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_off0000b5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D7 10404 bytes
SHA-256: b7afc0d82c3b54e44d46d71af2c84712cd970eac03b35683959aa8a49789d495
font_01_sfnt_off0000cd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD56 15840 bytes
SHA-256: 98d28975b7aab0dd72b2a3a941b112762f1a5b0000c3029743b7bf121ebb5bbb
font_02_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1