Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e576cf011084f1c…

MALICIOUS

PDF

81.3 KB Created: 2021-11-02 22:05:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7b5dc42c31c8cff1fd311e8d8f1e34e0 SHA-1: 2bc184df402f4f3bf9e434cc8c12fca81088e591 SHA-256: 4e576cf011084f1c98ea543753fa7f8a11d048cda0562c33025fbc3195c40d60
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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://beautydent.hu/editor_up/21620041435.pdf In PDF document text
    • https://kimcert.org/E/file/vozuzipojozapevomi.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/jozoputedizawadegisu.pdfIn PDF document text
    • http://asvpp.fr/pdf/kokefujevuw.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/10671579776.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/pasaleriwig.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/35260536962.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/77985486504.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/bobejofejavu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1617597341849d---45736424672.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/58545646893.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20211006214544.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/xarekidit.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/zijowirojimudowinoka.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/wikivaselozijibil.pdfIn PDF document text
    • http://splogservice.ru/content/files/78736033439.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/xidoji.pdfIn PDF document text
    • http://setunari.com/uploads/news/2021/09/26/file/zigabefes.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/37591648686.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16174775a17922---77272340620.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161345f475b438---jenedikuw.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/4677651624.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/bijezijikezogesorob.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/45326663043.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/vuvabogebegopawelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/xPAns0MRe5M/uplcv?utm_term=what+enzyme+is+responsible+for+unzipping+the+dna+double+helixPDF 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_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 18012 bytes
SHA-256: 44c30962b2d6a549ef96b9c10b2e51da2fd13dcfc89dcd7863d8edbe9a15d3d3
font_02_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 11452 bytes
SHA-256: f7ef6b388f2353437f3660020f8615874f9d1bdd14af2ebd445e53a6b6a550d5