Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c008e1a6402fd4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 20:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efa837185010ecda7f9a128ecd07ba37 SHA-1: 733309fbba6adac9626d448b4d9e20c09e531c03 SHA-256: 97c008e1a6402fd4cedc0cd61f54f77839c143eb605e3ae0932132d5f1596d39
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The file's structure suggests it's designed to act as a link farm, likely to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nomylo.ru/uplcv?utm_term=96.9+f+to+c
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a872eaa7c5---xobakaxa.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2710f99d810d797102e990a765ec1d97/faxawoxawovavilineluzomu.pdf
    • https://mai-avto.ru/upload_files/file/magopijalifusakusezili.pdf
    • http://inglewoodreunion.com/clients/68690/File/suxebolowo.pdf
    • https://acronimocostanzo.com/userfiles/file/64993352092.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076403b65a01---72368970449.pdf
    • https://maychieuvinh.vn/upload/files/tetilomenitopefidisa.pdf
    • http://macabrey-luthier.fr/data/Files/25065545895.pdf
    • http://uralteplostroy.ru/content/file/buvagotabusowafifezud.pdf
    • https://prestinieurope.ch/userfiles/files/debodani.pdf
    • https://iamtimeshare.com/userfiles/file/4737732341.pdf
    • http://alimentosldm.com/userfiles/file/66554082560.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16072240c6ca0c---52408543338.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e64f7d003---weruvazitijewasuzorob.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/kgtcciacbuq5fq3q2kboesl692/kiremitigijepuwuno.pdf
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/mezeval.pdf
    • http://abwsalisbury.com/uploads/files/kidigofaxela.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4abf0b7f01---76249079460.pdf
    • https://infotechbg.eu/file/binamazomef.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094845107018---20671219604.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7f5b905e2---34148174607.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607889cce225a---27228750259.pdf
    • https://kisikana.hr/UserFiles/files/31623461303.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/t5moldi413nanes9hgq08ir3kj/fodofit.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_off0000e069.bin
6c12c8e28b2ca5208d0e874626cf0f29bd0998ca33a607622c7c4168c1fa8971
pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 9828 bytes
font_01_sfnt_off0000f60e.bin
2603c7a2a9d92a2f59420ab153a5000ca4599be02424491ebd5d3a3c035e9d1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 17744 bytes
font_02_sfnt_off00012444.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 16792 bytes