Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b176dd2f080353…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 10:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f91705b82422d9e48997152174c04523 SHA-1: 8cdb6570b7d23529e2b0219ddefcc651edbdd4be SHA-256: c6b176dd2f08035329e7096dd180b8531ce0367e3d9df1c94c135a609a17eb85
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious or phishing sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://brcassociati.com/userfiles/files/65915126751.pdf In PDF document text
    • http://stylowa-pss.pl/userfiles/file/kisuxegoginusaxopataxeji.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/sakomubab.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/74749784002.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/80276275122.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e030b8dda8---telimag.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/zopujulesegonixagijapide.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/benugavudaje.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255c77659f3---woduwitotipi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160783ac58b2a5---pelemafuxadobodebuw.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/62d91cnbp9jj2n041gqok46rp5/riwimifetasewetepare.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/kenidutufexajom.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b8f46d4a8---lawudusirilikesivezum.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/zebilelupebododu.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/3878940124.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210606_025603.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/wupivekugagut.pdfIn PDF document text
    • http://imi.vc/upload/files/13671521961.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abd779708dc---80603372159.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/b546eu0dr3ujlhsfosf92bha1b/bakusimezulited.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/29a0c1d85262e077a026b155d786f982/komajagiwaratatarefesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=god+is+in+control+of+all+things+versePDF 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_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 19472 bytes
SHA-256: d2045f15df027e5129926f0d8c07f667b6f64994ed7529bce1e616ad0feed688
font_01_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 10860 bytes
SHA-256: 02418d82450e1c456c4b0167c218ea6d043e47758b49a29d6e22e70dda0161dd
font_02_sfnt_off000132ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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