Malicious PDF — malware analysis report

Static analysis result for SHA-256 78af8171404330b7…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 02:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 120c01befe68a596e0ee08ed06da0377 SHA-1: 61595a953f3a2946fb8ccbbc068af4ed583da230 SHA-256: 78af8171404330b78994f1e0c584e03c43b21e65ee26aa5b032c9dceb6cec24b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it could exploit PDF vulnerabilities or lead to malicious JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=convert+video+to+mp3+on+android PDF link annotation
    • http://ville-dammarie.com/ckfinder/userfiles/files/63568880591.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/72704700748.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/73914583739.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/71270447026.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/lujuxanirogekemimibozopig.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614be269e80d3---26261083629.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nolatigifelovitibafipetut.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/zigorozanagevaluzi.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/91039246671.pdfIn PDF document text
    • http://xfswchem.com/upload/files/83655517479.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/31030744505.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/56258400789.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/33620090485.pdfIn PDF document text
    • http://topp.pl/_topp/file/38792610088.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/bopadefuxikomo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613572c3a7aad---51581433985.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/70269025995.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/62847867309.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/me8lf73lk76rvhnfrhb5ldq863/28004609654.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1630636014.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/13237196713.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210904025317.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_off0000b132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 15996 bytes
SHA-256: 611abfd48fb92f770ca43e9970907d6c6e6c8ea63c36f414bfc015213a007409
font_01_sfnt_off0000d961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD961 10608 bytes
SHA-256: 08b83fd8038ec6d1d837851e709d55c247f3f312c3c4b8a1196e3ef682971f39
font_02_sfnt_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1