Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a72777f4fbe0a8c…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 18:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb2ed01ff7ce6f50ae69dabbea7ac98b SHA-1: 1912d82f54bdda5d3010002f7a35c04c94ad2234 SHA-256: 1a72777f4fbe0a8c63cb03770cc431a1768248cb2ea4f6d839e9a6a3d24e7606
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often involves JavaScript for redirection, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=nice+things+that+start+with+u PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd6cc6c485---73685948106.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358a0072689---49603477267.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/pilimofeniwi.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/1224399737.pdfIn PDF document text
    • http://njxinbell.com/upload/files/32523023158.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/520aba1e3363b8f099b8333f0023b918/37971172730.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/wafuxaxoviwatiku.pdfIn PDF document text
    • https://lasanisports.com/files/lavigalak.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/newujewefo.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/37815809076.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5d25307c---4921447515.pdfIn PDF document text
    • http://skisun.it/userfiles/files/61736531674.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff08f312bb---88745298386.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/lidakofijaxisutofor.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/54775336356.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/nowafixiregesopo.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109020306355173.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/magaduzelelarujowaruzaxu.pdfIn PDF document text
    • http://talesma.com/E/file/81487680567.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/rebiwafijuwup.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/wegazadasiligaxojujaz.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/jumune.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/51604811491.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_off0000cae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F5 17548 bytes
SHA-256: f8cac5a2e534e24440629cb06981aba43449da2965f575041e05dc8b70e330ed
font_02_sfnt_off00011096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 10504 bytes
SHA-256: 0b09daee224190d88452b3ce609efaec678be0d3d32920b2abe7fafeafa2830f

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