Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a12634ca5ccee53…

MALICIOUS

PDF

90.0 KB Created: 2021-06-30 05:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f75a23abe85e0ce63e1e625f3076a13 SHA-1: dd0cde723347314cc9bbf3a10b9cd6ce24e618da SHA-256: 7a12634ca5ccee5355e8d973f21c8348a2e3b86f96a517837368c51fda5a3838
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=love+always+meaning
    • http://sanarina.de/ckfinder/userfiles/files/32805707373.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072391f8d0ae---natamo.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/a3e8de2ce3e81f570bfa01bb2cbd80c8/vafetabomimeked.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609180b3e7c3e---98871505058.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/lu598crgprjh9p9b935kgnik8e/xituteloxedenu.pdf
    • http://sevinctekstil.com/resimler/files/fisofusomaxaxa.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/13a515d41fcd83b5aabc85574cb142d9/duxasevotuwagadetize.pdf
    • http://curry-box-deluxe.de/userfiles/file/rawenitopuxosumudezezenuw.pdf
    • https://oilbasaro.com/web/images/ckfinder/files/20210630022422.pdf
    • https://akapacha.com/userfiles/file/50995903842.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609da4c430d57---65079038324.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6a47668327b70ce80d978b6d892e7665/pedubenemuf.pdf
    • https://samowar.ch/upload/file/robebosamexigap.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ad2214f54ef267be2cc77920b2050982/buvomopizukepis.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/a3b8230ed665552c8b81974bf51a0fff/93876453491.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db92414801e---sipefejutidamegalatoxuf.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/12la9hi46fq3eusqcps7697hr5/faruj.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/819cd3930330dbeb91110e66164821f6/dewelas.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/qg6rllkh1l80maql3kjt7bkv2c/92608246444.pdf
    • https://grandegroup.net/files/82579020676.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072557b9cb9f---84148302037.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/70f5a1d44f97fb62e781f141d4554f9b/manuto.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c63ac10de67022a30eda70283e807477/pozidudofebujoguzopu.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/3e9fd6057d6e0614b0bbc881e500a19a/58869540571.pdf
    • http://coumert.com/images/file/digofilezono.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_off00010012.bin
1e3981a238bc7ca36da0fb5063979807811fb4ebb2935e24b247df572d7e3f38
pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 10476 bytes
font_01_sfnt_off000117e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 16792 bytes
font_02_sfnt_off00012ffa.bin
6027ef197565e060af7ad77b6735c324dfad47446af41a40605df5af32acc4be
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFA 16556 bytes