Malicious PDF — malware analysis report

Static analysis result for SHA-256 531ee74eb5d42203…

MALICIOUS

PDF

86.2 KB Created: 2021-08-28 16:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33290d444e5cb95b34e60b1be4c1d056 SHA-1: 3cc174d50549b716788104f111fa60af7e976fc5 SHA-256: 531ee74eb5d42203955bdea4e45a306e4b8accf2c9c90380b820948212d5d83b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various websites, many of which appear to be compromised. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=bible+chapter+of+the+day PDF link annotation
    • http://akinmedikal.com/uploads/file/simuketibujuvasow.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210822/file/73872086570.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaafed667---bovudubadiniwuxanoju.pdfIn PDF document text
    • http://talleresjpg.es/img/file/kefebejaxevatulinujojimi.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2d594f1dd3f82a575e579f7b9d8cfb72/gepobimugib.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/95942675478.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/10889925683.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/41402838657.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/30400334775.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/55753644574.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/74567983415.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/xugafubaleza.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/13h8absaan7shgmplf4vt43tvn/57516351951.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/53510969831.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/xizesezelavotexoj.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/87629937484.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/21643566562.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107db9532aeb---wasopisatev.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e7f736bfd---68017593837.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7161bdd84d---ditopuweko.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5110e749f2caeadae434cd0a30c73150/sitizosazuviwurewefuna.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e52a40674c6---16868439740.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_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 10752 bytes
SHA-256: b685bfdc5728862bc2a70e145c3b90ccaf9d6c18c58827bd0f943ad11a03b83a
font_02_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 22876 bytes
SHA-256: 8de2f57da82d27a6ec0ceb3e143deb5479d9ca757aee4aa00e9d09ae51fd6f6f

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