Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde37a1a2006f88b…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 08:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 17680bb9193adc09f3acf83f659ddcae SHA-1: e88f6f013ec616b3f4852229dc3ad33eff362894 SHA-256: cde37a1a2006f88bdb1ca1f7bff12ba9e4602df9aa1ad5f30a35fb418a82e792
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. These links likely serve to redirect users to phishing sites or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/rubororamomirofajemedu.pdf In PDF document text
    • https://ratoempat.com/contents/files/lafabusuvepofasux.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/xekojusavekupumimulorar.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9fab8728---sofojedujit.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/51811318287.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37738930359.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135839fbe5b7---20616462260.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/pufasevudemo.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/69469774949.pdfIn PDF document text
    • http://stefani.cz/fck/file/papuxu.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/42663620378.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d22cb556c---muviluxotus.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/88620955049.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135dfd58f380---7088053899.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/pawesufojezorekepexugigul.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109121046268050.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/manirajugus.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/19413377363.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/66343514831.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/13321408531.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/dametaji.pdfIn PDF document text
    • http://rld-carbon.ru/file/gotegobidisusotomatej.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/49705098010.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/bogatuwixuzaz.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210907195834_1825714895.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/21d6etqfo4la0iv9upfd51aafh/82117749723.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=binding+of+isaac+tarot+cardsPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 17984 bytes
SHA-256: 4dda78d7e2ca0d7b679615a660e7b83e0409917c6a0c19b2480fd8a77f1a817d
font_01_sfnt_off00011708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1F 10528 bytes
SHA-256: 2b0ccec3b34f3a1b43f2a0abad1a3ee1c50b21363678f51465bb18fca54ca90e

Open this report in the interactive analyzer, or submit your own file for analysis.