Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38767849476d27e…

MALICIOUS

PDF

88.0 KB Created: 2021-09-24 04:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f562a632ffcd21d12c96be0b2a2a50bc SHA-1: 111049001c9592d2a738923ae126531fde0ec31f SHA-256: c38767849476d27ec5e11975784982a67d31614c44dd0561f9970daa40bb8175
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sarvodayasamaj.uk/upload/files/jobababugos.pdf In PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/95480666999.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/91745649775.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/82218191692.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/worelipadepalaweto.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/nefilewuxigejanupebonigod.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/popugufe.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b689822838---86970757712.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/13425935231.pdfIn PDF document text
    • https://fishboat.hr/files/29204193884.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/4662300515.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/folofog.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/zomoxadoxagi.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/pajilabepixuruv.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/712b79143bb1a025752c237aeed31855/rawizuximigomuvuvikozef.pdfIn PDF document text
    • http://signauction.net/userfiles/file/76882857358.pdfIn PDF document text
    • https://31app.com/userfiles/file/kesuguwubalofanofeliru.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d76491eca17994c9f1660cdf7337f38c/26919441746.pdfIn PDF document text
    • http://safetruck.gr/images/file/56015910139.pdfIn PDF document text
    • http://szpk.hu/_user/file/jofobajividosasuda.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/rotededuxomomigawivubip.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/85629288281.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/82995794491.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/60797484551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=b612+8.4+7PDF 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_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 9876 bytes
SHA-256: ac951367d7362e49e3e12ceebd775c0967158a41dea1aae8742318b480834fc3
font_02_sfnt_off00012018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 19296 bytes
SHA-256: cf2daea8645dbaeaf953823e54c1bae47cd07b73a61cebff1c272c5135daad5e