Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9788afa10be325a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 19:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86eeaaf451a257c7fc6f527297369200 SHA-1: 67b15be3f8f2830864fbe3d63f867b2b32ae9e40 SHA-256: f9788afa10be325a77545f35b2b9e3149300c647d29a65a2bb8593b92cef5284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains. The presence of a URL with a 'utm_term' parameter suggests a phishing or social engineering lure, aiming to direct users to potentially malicious content. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=how+to+download+playstore+in+phone PDF link annotation
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/pitasobujufewew.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/pasekete.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cefd55448b2d6c17bcd038fddcd56a6/dosoruw.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vonuzun.pdfIn PDF document text
    • http://silver1979.com/upload/file/nekovevigitupozulino.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/zuxewubagiri.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/55466693407.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/87635175758.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/jirinogatenugelabudewi.pdfIn PDF document text
    • http://change4best.ru/upload/file/35497707007.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a080c224bbbdd22f3b3403481bb82b6d/75077038597.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/91241085796.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/raginasazabosufugov.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/42919043350.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86252eafb---33797821037.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/bokifipenoda.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/44129942873.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/96170169526.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/pibewuloru.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613834699ab0c---68503427000.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/62577386955.pdfIn PDF document text
    • http://firegallery.ru/img/upload/nebubibixedarojib.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_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 10680 bytes
SHA-256: 0ef41a284295704dcb8f2ec30c5d607ce4f44e9ee11441c86c49ebb8f7319aa6
font_01_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 18128 bytes
SHA-256: 0caba1567592d11773968b4ec36bb2598c626cd2c08ce050d724a18c5fa8531f
font_02_sfnt_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1