Malicious PDF — malware analysis report

Static analysis result for SHA-256 2868befc71c40700…

MALICIOUS

PDF

87.0 KB Created: 2021-07-02 05:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 139e9528d3fa84bfa3855eb4768b5220 SHA-1: c2c3a9760ade0dcf07f9531ecc83d958dd0ee237 SHA-256: 2868befc71c4070047f9956ebd1e25a206bd95a8cfa52a51e6bc89f1e8cdb93a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS uploads or disposable domains. The embedded URLs and the PDF structure suggest an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=funeral+etiquette+for+wearing+a+military+uniform
    • https://kocarbonag.com/luutru/files/tesasomo.pdf
    • http://www.chatanakonci.cz/userfiles/file/simetupukidesimodo.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2dc98c14---dujobelirirelezofikazapor.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98b1ee9755---87547754168.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160774985894d5---dufibetejufezokogisub.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/23ce78a2e832e015799d57e5ab9322fb/93511732644.pdf
    • http://adabaskimerkezi.com/upload/file/98583284885.pdf
    • http://cepsagibyachtfuels.com/images/photos/daxoximisi.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/chkmbkgvqjmaaseeopocvgkcru/47143643003.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5adaaf12---nasijigedapugupekuloxisu.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/658104b7ac3f1bfc8797e602064d6f18/vixuxonizivizukotubetewal.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d12e04a1a---7902784926.pdf
    • http://remaining-mc.de/userfiles/file/xaneret.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/13d40946cdf8daec35ec386780eadb94/15232010584.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/48969402575.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5bbe663e9---jolukifid.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad683a45119---zumidodafoxej.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a85e37adb---fojinugiwojov.pdf
    • http://omgmediatank.com/userfiles/files/ziseropov.pdf
    • https://1877painters.com/FCKeditor/file/9928692783.pdf
    • https://ajitcoatings.com/uploads/2356663933.pdf
    • http://haniltm.kr/upfiles/editor/files/43231679612.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_off0000f22b.bin
6a833546b963927ef462ccf40c4a135d9f4b9fbfa246cc264514fb9327547711
pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 16796 bytes
font_01_sfnt_off00011dae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 16792 bytes
font_02_sfnt_off000135c5.bin
aae7cca23c27cadeed340460eec2e9d4065896a20e172b694ba930178f51b5c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 10812 bytes