Malicious PDF — malware analysis report

Static analysis result for SHA-256 406f606b1dd7acac…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 11:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9c683bf4681a70f9701aa94d20a72f9 SHA-1: 914f526dc64f9f550e03400ebc2c02f9b2d2ee16 SHA-256: 406f606b1dd7acacce0a8032e15f85aef3cd854deae1d4b0d0d97aed436cc6b3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of multiple unknown URLs further supports this attack pattern.

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://kdekdyjak.cz/data/bekevaxefog.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e44a013862f---xoxex.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d89486df0a296a915957303d2c35d4f/28625404294.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3b87025a0514d654278c707ccb737901/gubososunozuzurikegu.pdfIn PDF document text
    • https://questyme.com/userfiles/file/77276012493.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/93522673769.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/19044941614.pdfIn PDF document text
    • http://amdind.com/userfiles/file/93414830700.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/netafosedid.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/pesow.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/fozepidiwa.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160884e5feeee1---58111472886.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xedaxin.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/48161764192.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/bonuxisokumakamomami.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/88259256788.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f4648f4e---nowewanebogatuve.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/jusixuzomagafifa.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/raxiterutop.pdfIn PDF document text
    • https://thepainter.asia/upload/files/69368425814.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/vizirirasebubikaneduwuja.pdfIn PDF document text
    • https://theurbanthinktank.com/files/fifakexagagipum.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/211003457487.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/wezeras.pdfIn PDF document text
    • http://dnepropress.net/files/file/birigimofop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=carcassonne+travel+guide+pdfPDF 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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 18296 bytes
SHA-256: 2cf72aeeefac2cfecb9baba250084a9023a2529907acf4d7c4fd91aeaa96da1a
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 10992 bytes
SHA-256: 68ae2b46b742de15c2296d27e0c86e93776817026d5b124c782d4ea961643266
font_02_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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