Malicious PDF — malware analysis report

Static analysis result for SHA-256 9429a9b9206eae11…

MALICIOUS

PDF

80.7 KB Created: 2021-08-26 17:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef347dfa570313bb34e2003b036121b5 SHA-1: 1b40c95e0750b913cd574d072470b6d0629f94ca SHA-256: 9429a9b9206eae11ce990447345b30d018a6261368e20b0413e5eb83a116da1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary attack pattern involves tricking users into visiting these links, which could lead to phishing or the download of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://murzilka.biz/images/uploads/file/vofevejosodogibisok.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65ba79ea2---duwopesowobol.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21aebd0fcbd1819837688e157a2a4084/mivilezituxuvugize.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/wakexuzekezawu.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/takawoduvazazizel.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/38971751933.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/mufuvetedadufusiromi.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/wosowo.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc68d514b4---75544821262.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/32694468117.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/noluxowinizasonakeki.pdfIn PDF document text
    • http://nensi.si/upload/file/dozaresafapiwefe.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/96802205403.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202108191926269398.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02437717c4.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609dacfd3ecdd---sapozes.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/130314046861.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/hfs8k5n0p856mvmm4h79qfon0l/98938693587.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a298d7e1610---jixemijotenunumulonama.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/25369308026.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f8067c9b50c---28554225178.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/vejuwilosumed.pdfIn PDF document text
    • https://dragulf.no/files/file/meranurefinesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=subsidized+federal+stafford+loan+interest+ratePDF link annotation
    • 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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 10720 bytes
SHA-256: 1737f23813ddbd685a823307087591845441b97ba67bc16de3be2436eef80717
font_01_sfnt_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 16620 bytes
SHA-256: dea1948ca9d31ab1c8365c6175fc8128e6ad3c7056e782909274b5ccc4a806c4
font_02_sfnt_off00011c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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