Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8c060f5d78de51…

MALICIOUS

PDF

80.0 KB Created: 2021-09-28 03:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2f435bab51b49e5d79e3e8f0d40d06f SHA-1: eae4d3ba445cc2b2ff6b88ddf4e52956943f0ecb SHA-256: 6f8c060f5d78de5171cf477c557296ab7a0c31ea774064b53417aa38cb339acb
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The presence of a raw IP address in one of the URIs and the overall structure suggest a link farm designed to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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://narcisse.sk/editor_uploads/files/84552287679.pdf
    • http://140.121.180.103/ckfinder/userfiles/files/87784654575.pdf
    • http://mousike.it/img_ins/files/riludirisunipuwixilajaro.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615170ceb7cc7---nugetaxavowixubusazerabo.pdf
    • http://conblocmanado.com/pics/file/maloduva.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/93422995099.pdf
    • http://abbeloosschinkels.be/userfiles/file/wexagukibibebivavamoki.pdf
    • http://runbo.net/upfiles/files/16306484798665.pdf
    • https://baongochoa.com/upload/file/85252773862.pdf
    • http://maiodi.com/userfiles/files/fevipigov.pdf
    • http://tubietelbar.hu/uploadfile/26010435634.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161402fa751088---87351677837.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c631f262f---46154676464.pdf
    • https://zohopin.com/calisma2/files/uploads/zasusatijesukitiluwow.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a585ea40c---zuvikufegasezo.pdf
    • http://webs123.com/userfiles/file/xaxudafesopuvivofekibok.pdf
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/33217735015.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161497cf486a8f---35729656836.pdf
    • http://andreaslasnik.com/data/files/28116409581.pdf
    • http://parikshitconstruction.com/uploads/57794972399.pdf
    • http://thessalonikiflights.com/files/files/22608886087.pdf
    • http://stellar.ru/ckfinder/userfiles/files/17523302788.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/murekobirifod.pdf
    • http://clinton.abwingsmd.com/uploads/files/96601685181.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/bf6e68232026590018a3e14d13123cf0/6640832875.pdf
    • http://bkdesign.ee/userfiles/file/vawekutomejanokenaj.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a2c35b2826658e9ee88c691cd3f73da4/27739351428.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=kof+apk+download
    • 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_off0000c8c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C9 16792 bytes
font_01_sfnt_off0000e0e0.bin
c588beff7023d19941c86708cdfdeb26f00129db38664a411c9880c147119484
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 10072 bytes
font_02_sfnt_off0000f769.bin
f6dbb711ea814feeb9b4aecadee8262d714dd884603b01c2caea5765d28abd20
pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 22716 bytes