Malicious PDF — malware analysis report

Static analysis result for SHA-256 93101226543c1867…

MALICIOUS

PDF

78.2 KB Created: 2021-09-12 17:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6d11a32c5df8d47efbfe6007a58e79f SHA-1: 82595ca5c779498f6bd85ece1132b08b77f5eca0 SHA-256: 93101226543c1867b66c3af8dd54019447233bbf6f43237d9e74bc2b0e16dee9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the overall structure strongly suggest an attempt to lure users to external resources, likely for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=pokemon+games+for+ppsspp+emulator+android+download PDF link annotation
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/61966015898.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/susopikofugixupokukoridij.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/16806428817.pdfIn PDF document text
    • http://boki.hu/editor_up/85875750926.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/76538330137.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/tobozopevopibop.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/80949020434.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/31420943611.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/34213228167.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132369a6e8fb---nefabutonoxifemezafa.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/59545886438.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/lazagefojejojerobafonij.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/45758631987.pdfIn PDF document text
    • https://sainaudit.mn/File/89250061432.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/madusukefok.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091104101773499.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/8185577083.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161358aee30e0a---xuwuzefusobimadarajopugi.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/53750609915.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/vosozexowabuvodetiruxo.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/kijuvoxode.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb76980b34---votirel.pdfIn PDF document text
    • https://phukienbep.net/media/files/19438739457.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e027ef968---tewusutenenovexotozejivav.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/657b2611638abff8a7607752c401ed8b/10098449315.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_off0000c9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F4 18080 bytes
SHA-256: 801298af9f1bf921a54e31599b0c52a4575585590805dd4a5ac296732e3765f2
font_01_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 11120 bytes
SHA-256: 2a90e4a95c9d23fbe8f6eadbf61e9446ae7d9e861f0be2b5f6c9ab89306927b7

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