Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1001a2213e599cc…

MALICIOUS

PDF

95.7 KB Created: 2021-08-19 09:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c6123809e044e3a19c1600282eb5f8e5 SHA-1: eceb3a8f400d1963163dead767ced573333c5b15 SHA-256: c1001a2213e599cc4020a9156a9d8c74b437cea79d26c6d37a5e27d0e2c276bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2920

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://drafthe.ru/uplcv?utm_term=aplicaciones+de+la+integral+indefinida+ejercicios+resueltos+pdf PDF link annotation
    • http://bvsaigonbinhduong.vn/uploads/files/muwefojevuxive.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097866653f3b---37795554113.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/49397857844.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/xogeboliwodezijajegof.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/77805638531.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/jexubisaj.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fewupodokixajidagagidelo.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160857729a381c---5348451357.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/nituvofakijulijolobe.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/cff399c99c9d67fb9ffa1884da64b202/ledawewuvuguvom.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ojpldmqtt83mphsdv8itibb5ls/27884648237.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/pajirakije.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/dad063839ffe552b96aabd1a96a8dd19/viwolilanulejeburerenixeb.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc9b3ce972---36783895828.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/484d6234c1d99474c5baeecbe3985373/tibetufatokakewukope.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/xopirizovupuveko.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/wugebifosomuze.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829966d15c0---rixubiripo.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb8c4d8b8---nugekujodan.pdfIn PDF document text
    • http://talleresjpg.es/img/file/31210940148.pdfIn PDF document text
    • http://modern-pro.ru/files/file/82995515607.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/5307090741.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/i7n4jjpejqj28vvdfs8mkhbbh1/93562076018.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/18981670850.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ace17484b09---5550190275.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 11004 bytes
SHA-256: e22deee44e3ab466aca1829216b9bb80f822936b5b4999d0b21827bd51f18b99
font_01_sfnt_off0001422b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422B 18904 bytes
SHA-256: 68a65917f9bfe1f457e8c817b44ce4f82cbcaa64038d07242bf11b914fb28bd8