Malicious PDF — malware analysis report

Static analysis result for SHA-256 8806e256c3a19297…

MALICIOUS

PDF

79.2 KB Created: 2021-09-24 00:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1da635c6510ad7135d05c5658bbdf435 SHA-1: 81f6bb92fe707ce9ec9ba6e4da1b54ae95364cd2 SHA-256: 8806e256c3a19297554d9550150ad8ef36deeefa9c6757a776dcf53bd2a81d56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=watch+criminal+minds+putlockers PDF link annotation
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/2055153234.pdfIn PDF document text
    • http://infracsap.hu/files/file/63517909623.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210912011333.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/fuputokaru.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/49118012854.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/pipabufiropopibidaximege.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148915f20db9---nasatig.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/54949439623.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/giluvomo.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/20360382835.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092215323073499.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210908202540.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/riwom.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/54486363082.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/66797405648.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/78010174167.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/20979820517.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613081b1a62fe---texokosiw.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/92361032496.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/55400136589.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140012e9304e---93248527186.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/dijivawu.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/gozosibaxuvesajatifalijaj.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/42123424574.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_off0000d1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C6 10964 bytes
SHA-256: 7ac4118cfd4fa72de8aae0ab2f3b4cbc66bb388005e37b314e7f66a6985b4815
font_01_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 17192 bytes
SHA-256: 7bf5a3855d06d9449e65e9171eefc3befe23b20e7d851d63069529c7d71e1d39
font_02_sfnt_off00011715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1