Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc070146a454f6d…

MALICIOUS

PDF

92.7 KB Created: 2021-08-14 11:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e03185f99cdcf72cf9df264be37b2c9f SHA-1: 318508a707cc04c19e91b7444e7ae0a849e0950f SHA-256: ecc070146a454f6d8f3a62461b50176180efc654b7f4c542fd7a1230c7a86162
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites or disposable domains. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://aqs-group.it/userfiles/files/gawelaxedipururino.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/c3uvqdu5hitudq4siuoi5d0nq6/webaxojoradegujumexadebe.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59d9ae94a6b2f1605cb486a9f9d588ce/58002767586.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/3926716010.pdf
    • http://www.zywawiara.pl/pliki/xowepunegujirare.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/9484f00e8b941d4c4725dab08fed6221/39656295106.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ec2e6b82---83259378546.pdf
    • http://vagtteam.dk/userfiles/Files/lalemilovedodamilola.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/52446648371.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16115277bb5c38---bobevosobej.pdf
    • https://styliststudios.com/imagesTE/file/63487938360.pdf
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/78459764662.pdf
    • https://nevisnews.com/userfiles/ruvamesotabido.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b4cb1a1c---34726875606.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/igijo1tccv25sh5h0507cfednq/moropufevowupof.pdf
    • http://vizugy.hu/uploads/files/files/65151339416.pdf
    • https://privatecambodiatour.com/userfiles/file/wopipumepatunawo.pdf
    • https://farmacieitaliane.com/documenti/file/fixisunan.pdf
    • https://tenekedjieva.com/uploads/file/82950591121.pdf
    • http://dermaktif.com/imgup/file/bukalux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=forever+stratovarius+piano+sheet+music+free
    • 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_off00010583.bin
630b2a2c0dafcbbef6d557e1ab4e709dd2f9a96b5c749e79718fa0ea8efdfba7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 17568 bytes
font_01_sfnt_off00013373.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13373 16792 bytes
font_02_sfnt_off00014b8a.bin
66fac359748c87841bade66e741c7c16c31af2a2ed2b09e788e33734cc8eb844
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8A 10844 bytes