Malicious PDF — malware analysis report

Static analysis result for SHA-256 a833960d1132f189…

MALICIOUS

PDF

92.0 KB Created: 2021-06-25 21:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 88041d63c438496959e84be59c36f21c SHA-1: 6c4ca7d3a457366472aab35d5f353d2f1149cbca SHA-256: a833960d1132f1891f113c3210d29c289f747e235bdc766cdd536337606c409e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using compromised infrastructure for distribution. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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=nier+automata+chip+fusing+guide PDF link annotation
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5acab1ee4a---11794350719.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/60219502964.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/43891808287.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/15202254715.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/sebedizifojabimetu.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/31504162520.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5545326c0---93275548856.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608115681796f---xidobiraf.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/3hg82rnasg4ve5f6eaf77jv3r0/gojupalonode.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lsbpa0140le5okc3q7p26eb2cm/nivirakimozetozudedavo.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/151c2a436030a6dc142b1da755eaf3ee/35830410080.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b392b39902---46699178312.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/185s6lp9cnauk0vmkuvif80mbv/32611935478.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/safisu.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/visukaxexovefesonotu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608e01b833cb1---39622955711.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/70935776078.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/kewexejejoxewodubasikewa.pdfIn PDF document text
    • https://mmszke.hu/files/file/kemovox.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f682c82d48---18320498029.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/56cc0136e15cd55ccd083fca27a63033/66770154947.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160723558c957e---zajajoguw.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/37f24f01a945cd4e15eed4eb0d336420/15984132715.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/54484809892.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000de46.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDE46 21308 bytes
SHA-256: 4fa06276e9c7c595add6dafe23bd22d6b4748d920aa91f8e0c9e44d6dd170dec
font_01_sfnt_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 16888 bytes
SHA-256: c73ca225ba6fa58086b762c6790b2c2590df9e38f4985d1d8e76feb42d602704
font_02_sfnt_off00012f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F04 11096 bytes
SHA-256: 76ec004faee9a29291e1405334ebcfbff75938f0fb53e041d899dee8b2d64d93
font_03_sfnt_off0001488c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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