Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cb690df3284071…

MALICIOUS

PDF

95.1 KB Created: 2021-09-17 22:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3e4ee4ca48dab7f90ac0fe6754478802 SHA-1: 9c6a56a3e6370d112f2c368b00351a5b10478c4e SHA-256: c8cb690df3284071af107dde2815e0693872cfd662a2b74b5e444bf15c72530c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for malicious PDFs. It also features a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b3577edb---vutalomawidewakowez.pdf In PDF document text
    • http://unleadedcoffee.cz/soubory/13415477024.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/wuluseparejupojo.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140aebe387af---leruje.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/loberijuw.pdfIn PDF document text
    • https://mackbeks.com/files/file/wovuvasolugovarakodepu.pdfIn PDF document text
    • https://ibextrail.com/editor-images/tarivojujek.pdfIn PDF document text
    • http://starma.pl/files/file/midojiletugutuxakerali.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/dalesidurukow.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/pajotefubasoziga.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/20618150900.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f524d67282---zorafaganumibavapivirax.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/zajutexepekume.pdfPDF link annotation
    • http://proclima-membranes.ru/userfiles/file/30131694188.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/69333610883.pdfIn PDF document text
    • https://senfina.top/uploads/files/10747785225.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/33163307456.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/81512907862.pdfIn PDF document text
    • http://tid.vn/upload/files/85956746891.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/63005476710.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/pigoditadonusepona.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/jikilegiliri.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/ganinur.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/71983877801.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/joputimavumofugusinigopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+go+cheats+2021+iphonePDF 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_off00010c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 18724 bytes
SHA-256: 73662b6b2f6420d546f852455037ff7d05399afa1db892440958a4ff20e5396d
font_01_sfnt_off00013cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDA 11060 bytes
SHA-256: a87aba2d7a512850c7407a8ea094fbe26abbc367720e1ee21b663f003903453e
font_02_sfnt_off00015696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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