Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4833de9aafd8fc…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 07:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5785c1c9cb4a9c9c3a7a0ca3865abdb2 SHA-1: e80ce26b9bd5b8952c59d3677f8a2950b3407d4c SHA-256: ca4833de9aafd8fc2b9fb63a6d096804bf3e4ad1b0d6c48931684799be180b07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inwebjor.ru/uplcv?utm_term=high+level+programming+language+pdf PDF link annotation
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949127293e0---31752759568.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b6919da3c---64883061222.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/71631508481.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/32950541586.pdfIn PDF document text
    • https://ptogel2.com/contents//files/vovimevabove.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607871220358a---pasonifun.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/p2h3b0smgajom46rf79mdpdim5/velumefajizuzu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f75c8863bb---83568983102.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4222344c---59582074517.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1294417b2---lojizutufip.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4e9a1b5fe27becb49e6bdc665d5c3ed2/nejudevujabalawadod.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/geroluga.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/wimubejol.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b2a51640817a5996b38bf49dbb9130d9/21196768358.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f4935e3134d---6737784741.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/36273327273.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/gemuliwedinomezur.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/pavexividarofuba.pdfIn PDF document text
    • http://goldmustang.ru/files/files/24080171400.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/0005927986f4b845e48e8f07fd2e3f2b/52833736307.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/jixowokedikekopekeg.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_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 17260 bytes
SHA-256: 694b79191039346402de10e9b7234eae5b51599e1671fe01efb154c1aef30f86
font_02_sfnt_off00012630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12630 10836 bytes
SHA-256: 910bb2dc1b737eda63f58266e03fbd41cc30d4b7243d490e9954869ffead3e4b

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