Malicious PDF — malware analysis report

Static analysis result for SHA-256 b613de987016cc37…

MALICIOUS

PDF

124.7 KB Created: 2021-08-25 03:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: a6db16180e774ca7284e1893586d516c SHA-1: ee5779737406bdc7578cefa565b81af86d4d1c66 SHA-256: b613de987016cc377d05a043dd312c32484a71e092377e899c1178bbd753cf3d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://laborke.ru/uplcv?utm_term=roblox+unblocked+free PDF link annotation
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ef078ef5864b1b59502be19cef9eaa05/41306853533.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/235148432c57d97bbbb164dd1fed8a5a/jezijorogafazuvinezudupow.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/24892597385.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/lebogixufadudojovupose.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/97424673698.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/tegarizawe.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff0cab6db5---fejokejak.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/xapapeva.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/69175534276.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/17825116040.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/18vatlcfjcbnj9i4vik9310seg/79029154964.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/18982359042.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/43807d01f10d627547b1be067d10f61d/1117851831.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/df321cb00e55546ea442184551461ab4/82860164440.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/pitibunad.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210815005657.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/kojukosiv.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fa65d5c1489---83822379678.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B1 25876 bytes
SHA-256: baa6876a8391e3cb7db45db4071bda654176b248c656968e20bdffeb85dd028e
font_01_sfnt_off000178cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000190d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190D9 9484 bytes
SHA-256: 9a9e463376f73c47840d3053168abaf728cc5702fe816850f83511a1cdf3b3a8
font_03_sfnt_off0001b16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B16F 17448 bytes
SHA-256: 78deb0090bb370735d37ddec460a26bb23fc871cbc6109d63614cafc1c3e419c
font_04_sfnt_off0001cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC0E 10428 bytes
SHA-256: b10a545dc1645d95efaf8078af92516d6144caa60ecdcc47c4ef58cd15449e07

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