Malicious PDF — malware analysis report

Static analysis result for SHA-256 397e8d6bfc16c042…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 17:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4e46c3960a37aa71e92714a606733690 SHA-1: b0f3d80b269a8ef2e4efad1ef023ecf6e5c267ed SHA-256: 397e8d6bfc16c04266225477a0e6454bb007811dea566db24b8c79dc05fd05f1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of these links and the overall detection score strongly suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=speech+banana+audiogram+pdf PDF link annotation
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/21bf996dea0f870f6deb2b821b149034/fugopefosanomik.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/67269443533.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/771100645.pdfIn PDF document text
    • http://pb-book.com/user_file/file/8815943275.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6f3c58aaf---vigopibara.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c3cdd3d5---810649260.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210803090055.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/92572178657.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/jawarubakegusid.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/11111838351.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/4d3f2m3sacsb0etub9vkv2fipk/48573504610.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/24bdc3efa111209e1a5760997fa40d64/jojisuwigosudusikefusezex.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/51133292281.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/43ac486acf5b6f5cf82729f1d3df1bf1/lelirozuturijadivejimo.pdfIn PDF document text
    • http://amdind.com/userfiles/file/56204879976.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160874ef326c9a---bawip.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/55129236336.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f55f53d57ebf65094572a9f943bd8ea6/29181612349.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88542667910.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/64776414204.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/tatusogolipe.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0ca79c1c3e32e5b2413a6bebd55610cf/natiwawilopefewiga.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_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 17716 bytes
SHA-256: e61133139419629740f301d231d9c9ecfd35bd952ad6d62df49b3fc506259f55
font_02_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 11072 bytes
SHA-256: 855c488bcea49bedd466f72f221c257ff2706133d4c935d2e961b6ba6debd545

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