Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4a7ca7e4c3049f…

MALICIOUS

PDF

83.7 KB Created: 2021-06-30 02:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 451ed96349bb06b84c46e715fb056506 SHA-1: 52438dfc76c403725bd1aadd562475104ad1eff5 SHA-256: dd4a7ca7e4c3049fd260163c9e7e91cc5604d7e14bba12bd51911d28a3ec519e
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 it likely contains malicious content. Heuristics reveal it functions as a link farm, with numerous external URIs pointing to various domains, some of which are hosted on compromised WordPress sites. This suggests an attempt to distribute malicious links or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=how+to+put+green+screen+on+imovie PDF link annotation
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/97525025775.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/u2r6qmeuder5b5gtnbf1rouk63/52303654476.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/v13q3uhr3ja8jgj7fvfg1e7728/66715688544.pdfIn PDF document text
    • http://asfalon.com/__files/file/39470776154.pdfIn PDF document text
    • https://laps.pl/userfiles/file/junenoketanexinekukafajud.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/76759734258.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/658f256222df1bb2f5dc2e884e2bdc88/39752593939.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/gokup.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105181946427384418h5ams.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/20422152009.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c22429c38a0c90177fd4e03714f4cca5/96804775550.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/tekafewotutuki.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160701fb82f45c---62934211615.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a02477ad612---35624292840.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090990273199---91046443165.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96fe410dbf.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/37edc3bb8c2bc374c0958d8bc3facb8d/fusalofemapaveguzoj.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/iec2hov2pjc537gm2rlfp8c5s9/72642815955.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/newuwazudojorox.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/61362603274.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/78518243343.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/396cd98367da27a2cabc25c1a1030bad/66590059443.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e4af35593---15286383565.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1692_20210605102441.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/30459944610.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_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 17140 bytes
SHA-256: 575fdd12363c0c40bab2d8de7d8498934b27a428b2180468b9ed8514da02c9cc
font_01_sfnt_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B2 10752 bytes
SHA-256: 7d55ad6ac89e9d6ac4b1dbb9cc556c835de602a8808bfe5d5b347e5c4540cea5

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