Malicious PDF — malware analysis report

Static analysis result for SHA-256 d121cbc984a45e0c…

MALICIOUS

PDF

91.6 KB Created: 2021-08-11 19:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 10a194820fbc5ab633a793a1ba633b62 SHA-1: c8e908cbff43f5ce7111024171eb342767ccc048 SHA-256: d121cbc984a45e0cf9ed73a32998372a278f0430ec01f3e89046e278e42e64c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute phishing content or redirect users to malicious sites. No scripts were extracted, but the presence of multiple external URIs and the overall structure indicate a malicious intent to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ketchas.ru/uplcv?utm_term=shielded+metal+arc+welding+book+pdf PDF link annotation
    • http://aaykpn.com/uploads/editor/files/75067989588.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/saxenasud.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/lubovaguniwemuxeteboxurob.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d49c12933---53922355736.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/42488043038.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/paxazaj.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/jexovodenaresufupop.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f21fb078eb15774db48ca59dd56dd883/zaxifovatizamofamomameri.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077babb3e375---5939233401.pdfIn PDF document text
    • https://marosme.ro/hirek/file/beginepo.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/82587855001.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/genuxowobig.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ab64dddf75f---2447683758.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/39269143589.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/nunogev.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/patn6vrq87naeb9rcm61i9r8t1/wuvokosumudodenozik.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/95179277154.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/fabuzidosefidifi.pdfIn PDF document text
    • https://media-get.com/userfiles/files/34433948577.pdfIn PDF document text
    • http://benetalent.com/upload/files/80043898797.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/32071748630.pdfIn PDF document text
    • 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_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 18524 bytes
SHA-256: 9632b013408999dc36dca6c6a878e6da8b154b8d3e7f87f98736d9a6b10648b1
font_01_sfnt_off00012f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14740 11292 bytes
SHA-256: cd1d350314b1c6d893f6e62b42a170a83a2699b28967249d769b3a980c58ce41