Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcb99739898201a…

MALICIOUS

PDF

104.0 KB Created: 2021-06-25 21:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42a5a4bab3a676db4b69d22a8191f294 SHA-1: 2e500f7221d50ebd22b4769196a5da87b8f5573f SHA-256: 7fcb99739898201a88c4a5a32e4ab6ceaa834462fcfe092a7e50cf3959046c32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/m9qvb57bofm4tdl93v4nq9aivp/jabibunejotisejamutaj.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e5576084---kodugozonodomosovutajebax.pdf
    • http://casier-a-bouteilles.com/file/pizanijebitojip.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/i6p4a6lt65j1nkgrsh7ma92a03/misupijakebuwinurarotit.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160986de04be73---jujikikudewomegowobo.pdf
    • https://stopserv.ru/files/file/wajirus.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa647956c01---43540050637.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/0ktdfc343cgjpl99rgutomu5ac/8887082624.pdf
    • https://perfecthospital.net/FCKeditor/file/fewololupi.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/0oood7atp36qk536m63d7odmdt/42155142588.pdf
    • http://activesolutionelectric.com/images/file/23916371386.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160901abb03853---lenafotupelivimujubunaf.pdf
    • http://worldprint.su/userfiles/file/xodaliwomukif.pdf
    • http://c2r-auto.com/uploadfiles/file/2021052805552473499.pdf
    • http://cottoneauto.it/userfiles/files/40885399904.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/zeledomesuk.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a84844215ca---dejodufel.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/13505865682.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c131478d33---devenevasalolurebu.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bspohghvt55hi4nkk55k6rvnl2/bojabujuwipubelarafupejan.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/87988138881.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47f5b2771f---votivakinodilojifib.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/347218a2b67af88107e39664285ba7dd/vepefajep.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/6d5c54469d1614c5231d2d977ec8e17b/xabuvilowovijaranakoza.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/047b9550841c7f863e39a03626341303/zapodubosodezikurik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=7.3+independent+practice+answer+key
    • 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_off000131d0.bin
fc139d3c4d19d4172f4c103efff47f21de7e5d770fb723fe146104cbb0a452e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D0 18060 bytes
font_01_sfnt_off00016137.bin
dad902415aec4b7fd4febf12e9904199a1d90800c0488c61d40bebd0d9709ce6
pdf-font-stream PDF embedded font (sfnt) at offset 0x16137 10824 bytes
font_02_sfnt_off00017a73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A73 16792 bytes