Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54ada54d729cccb…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 21:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 142b57ad6059246d62ae757765029c2b SHA-1: ef4de78246edbf899937e1431b14ecfa86588c93 SHA-256: f54ada54d729cccbf1d1f188b4aedcff5e792106ac691069cda3de8abb7f7bde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=italo+svevo+libri+pdf
    • http://tiramisu-o.com/yamituki-n/uploads/files/tewetatuzaxupixanezina.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/77705586909.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8cf37c73d6078f11ee9c0da646f784f4/sizenu.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/6untpqgt40nu0voj4di91a7t6c/rewabif.pdf
    • http://toyotalongbien.org/data/dulieu/files/ragepawuxutet.pdf
    • https://lesfeesdelhetre.fr/upload/files/medibuwagope.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/285605506.pdf
    • http://totoquynhhuong.com/upload/files/vukipipezoxomuwa.pdf
    • http://web-news.eu/www/pkpar/userfiles/file/lupeluveratebutik.pdf
    • https://poker-fire.de/file/zopezenikawim.pdf
    • https://www.studioline.ie/ckfinder/userfiles/files/9941979222.pdf
    • https://gozdemsigorta.com/hulya/upload/files/nupowaniwawovari.pdf
    • http://fotossc.pl/_files/file/baliluvisubawafonivovoje.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99a0ac4f2---noruva.pdf
    • http://mabo-meccanica.eu/userfiles/files/12478497733.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/4l03nptfupnumk8cea109mdjh6/sedezusor.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d39c0c1e4---54128309078.pdf
    • http://tortsurprise.ru/upload/redactor/files/92795229385.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1da5a4b6---33856718235.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16070327fd705f---64809584133.pdf
    • https://activepymes.com/pub/file/75310098448.pdf
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/19386684926.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/bd1c67091bef1767222ed83ee3337922/tikexadijinevegipobuluw.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d62cfd29b0---98695347754.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160799c472498b---pofuxupezar.pdf
    • 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_off0000eb80.bin
3502408df1fb210116d76db167b7fab50c8cbe5f6b8f4440371d186ef67a8956
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 10544 bytes
font_01_sfnt_off00010376.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 16792 bytes
font_02_sfnt_off00011b88.bin
f08a17e6fa43ee83d3b1b86c522852c5642bae3c637176bf59b96a207ef5c3b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B88 18352 bytes