Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9443ab35a33a11…

MALICIOUS

PDF

85.6 KB Created: 2021-06-25 20:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6aea34ad5bb9022ffb8cdaa210a88cdd SHA-1: 1ffc76e28f9c30010637995908225f80bc9815f4 SHA-256: 1f9443ab35a33a111a87c79bb591aaa688e0c9c99b48249d41468c161f130798
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm hosted on compromised WordPress upload storage, as indicated by multiple heuristics and the ClamAV detection. The ML classifier also flagged this PDF as malicious. The presence of numerous links to potentially malicious PDF files suggests an attempt to direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c6f21602a---kakutazosegemokufigowo.pdf In PDF document text
    • http://maskaevlawyer.ru/userfiles/file/50656699423.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/rotaxojogowulejogijog.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/gabigizuti.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/mavuxemiwoleraxefet.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed6268d221---zitozipolexewunekir.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a891c550b08d197082621925e22ed3ff/xejuxomewaxetofibi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p3f9nf5h9bscogkmmtmfjl6834/51952848704.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b140f659bd---45213192788.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/bivuta.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/72fec8eccad5f725220aa6a9edb0ca0c/20478541574.pdfIn PDF document text
    • http://come2menorca.com/images/file/12076175795.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/38711203477.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/99504960871.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/40015445269.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/jakazemofi.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d11088b8c0f5e3bd657e58a40a109c69/98236235288.pdfIn PDF document text
    • http://ropesadventure.com/d/files/49675162440.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/vqm8d26790453vthmr4jhbrd9d/xolemagiwinifakanub.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/nejikekerewexalozada.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/pv4totm70vf2kqikvma9k2hr5s/xabebamazimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=easter+2006+datePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 16764 bytes
SHA-256: f203b469a9c5096e357290a2776c7396730314e46ad7163f9e6580f6e184bc7a
font_01_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 10272 bytes
SHA-256: ca019f929870581f949aeff110b833767caa87000e98f43975f69651c713bef1
font_02_sfnt_off000131a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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