Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c71bf232adbe945…

MALICIOUS

PDF

75.8 KB Created: 2021-09-03 14:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f8a4215ca4005b31ade1a002d70aeeb SHA-1: 60a5178dc09da8b048b3ef51caba0a1df9ac34bf SHA-256: 1c71bf232adbe9450b75e8e77be1fc82ef55b3fd269d0ff3caff79517909b251
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple links on compromised or disposable hosting reinforces the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607669bf9789b---22952943337.pdf In PDF document text
    • http://fields-on-earth.com/tutogiwajapokigivadegeg.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/33987830094.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/6937205567.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/bc941412775ef242f304f5c3a70b7d47/wupubufi.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/47821794534.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021080917455484.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd4058df28---kifikamolorezasarep.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/80504785588.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/soxodikekutikilinafa.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/vbccbngri0s820drh6qdn3j945/miretigibupakanadera.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a00ae8fbb5449c580c671e45c6d9583d/giloxipa.pdfIn PDF document text
    • https://jurad.eu/files/file/romujuzadezodoperalubo.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/97387560310.pdfIn PDF document text
    • http://ymmicro.com/files/files/didilu.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/up77d7su9qo67lkij63mogkgsu/peravota.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/ripopalafubiwu.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/57167406134.pdfIn PDF document text
    • http://rilta.net/userfiles/files/tonojupavuwawalamuxomu.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/vovelak.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/58335323050.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/62663136760d09bd2d981e.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/93729028385.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/4858881701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=janitza+umg+508+manualPDF 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_off0000c437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC437 17564 bytes
SHA-256: fdcb30900aa24cd92a7b5a41997c826ec9619696f043bf0f55ca6179468b150f
font_01_sfnt_off0000f20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 10544 bytes
SHA-256: 7abafaaa6845cd2f486891761a24e1a7243c3df0a71a9e77986ddec92c4d04d1
font_02_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1