Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93ee9334ca02d4b…

MALICIOUS

PDF

84.4 KB Created: 2021-11-06 09:56:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a8e0f25cf2868364eec999b46324842b SHA-1: e3e0d97b01657d9cc32280caba8301b29dc8d920 SHA-256: a93ee9334ca02d4b41f5dd1f6f53b8e9bc5aa3e52c93c2a0f03ba85e2515ba40
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16184c806de6de---rototutubumof.pdf In PDF document text
    • http://xtra360.net/campannas/file/gawivawedopofogiparaneza.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16141267b0b7a0---tarevonaketurikubixuxet.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/58225142355.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/wonujunipebigolun.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/64029737985.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/828d4d2a03da0a9e20f0edffbfbad6e4/niselupurenugulejuse.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161674f4a91376---98063771265.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613072f42be9c---72085514934.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/39661997667.pdfIn PDF document text
    • http://yuha.be/_files/file/jodowegebazupitebamo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-10-1/20211001113211681753.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/dawofalat.pdfIn PDF document text
    • http://dobosugyvedkecskemet.hu/userfiles/file/tokebonibow.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/runavixufasizejitivi.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/35607690803.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/momerupinirupukimi.pdfIn PDF document text
    • https://fptica.ru/images/file/dedowobaxebefafufen.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021101416203473499.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1618345edc14eb---49177637879.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20211105210806.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16170db9f34fe1---58405017308.pdfIn PDF document text
    • http://beta-rc.com/upload/files/nadazupevelulabemuko.pdfIn PDF document text
    • http://consorzio.artforjob.it/userfiles/file/sagozewipobufija.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/896FEnmJZlk/uplcv?utm_term=nord+stage+3+manualPDF 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_off0000e254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE254 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 10748 bytes
SHA-256: b9b7e1d3a041c263e7a82d5e8be382fcc4023f53092b7a48c4e97e79e59c0073
font_02_sfnt_off00011205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 18792 bytes
SHA-256: b1e8b244283e54b44bc357e2b0521ef16b06e941b0635b7dc9894bc31f44cfde