Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27bd153ecc93deb…

MALICIOUS

PDF

99.4 KB Created: 2021-06-26 01:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d637cebb33e88d8e475d6f22e40e0f0 SHA-1: 76bab98acb8c23d288687f96a387b2e1c1e56481 SHA-256: d27bd153ecc93debd76532ead357ffaffa53996f76884c0fdb69771f4a0acafd
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal the PDF acts as a link farm, directing users to multiple domains, some of which are hosted on compromised WordPress sites or appear to be disposable. These links likely lead to the download of further malicious content, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://penzionriverside.cz/files/file/7445367327.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/31cbbe5c53a22502e8ac4216169aca67/ziderazeji.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62473b06f6d1ecd18afb59d42e99e0a7/4088835031.pdf
    • http://au-coeur-du-temps.com/userfiles/file/lekixa.pdf
    • https://ceccarbotosani.ro/userfiles/file/tokimapagapurunituzufo.pdf
    • http://carrozzeriabosini.net/userfiles/files/87129592977.pdf
    • http://seoulmenu.com/uploads/files/39887094780.pdf
    • https://vinniescustoms.com/userfiles/files/61301819194.pdf
    • https://aravlicraft.com/cmsCart//upload/file/62920363289.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a134eb121---49311967992.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/690071334.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ju7eopbq6sm80m46f9vlc8qnv6/25778373303.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b90fcc545f7---buwegafezovigakib.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9a4cdb42f6fe83e71705a3d9b6df3e92/vozem.pdf
    • https://thaiwoodengames.com/files/upload/files/7595389169.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/vnbttpq0drmbpfn6f3tag3ibmq/70052865642.pdf
    • http://goref.ru/files/file/32356468766.pdf
    • http://stasta.com/userfiles/file/fuwimigilabol.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/54f0114d27086495dcf242547d2bc12e/majaxasawavelejim.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160955a419d984---xefatoremelig.pdf
    • http://akkoryazilim.com/userfiles/file/vebelowuxejibuzibonewirud.pdf
    • http://bearings-home.com/userfiles/file/66175306808.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160986cf81a05a---13913925501.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be1b03b56a1---64539390073.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=road+less+travelled+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012552.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 16792 bytes
font_01_sfnt_off00013d64.bin
a8ef932483ad024f3a8f5749c7d1783a5f17d025ebd812b09db7c3c30eb1f130
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D64 16368 bytes
font_02_sfnt_off000167a8.bin
84f688535954197dfc88e81798f5619555267d8496f4e34720f1a1f46a986ab2
pdf-font-stream PDF embedded font (sfnt) at offset 0x167A8 10596 bytes