Malicious PDF — malware analysis report

Static analysis result for SHA-256 881638f1823b6a33…

MALICIOUS

PDF

107.3 KB Created: 2021-07-29 22:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74b278ddb60498d77e490ad4209c5f06 SHA-1: f3d76f8dfa28943a33c70212c0dee0bcbe1bad85 SHA-256: 881638f1823b6a334816970e2f71b3ef5696b9065b1e7747d6a82bdbf4f75602
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://meijialx.com/ckfinder/userfiles/files/gifon.pdf In PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/u56smedngeol2tidaj6t536r2c/gifolezukeguvijirij.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/b48ahj5ej9aoepqaj2cg5m3m83/lavamome.pdfIn PDF document text
    • https://aashianarealty.com/file/73129153823.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb309c7889---99480421587.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/lamaketiwoduzeb.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff3a77ca0a---malelitonolojusirabe.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/motativosapowobini.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/cdf9e04045aac8eb5be618d2db231e99/46078054282.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/84f7fc6ceef1b04b6cb74dbfed210f1c/lolurifezinelarajitag.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/8536044409.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210714_42E7A92863A04323.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/55300892975.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/ranoguginususob.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/xatixarikesusedatuvezelu.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb10224f8---67505217394.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608560116a875---fesidafeludinarawokida.pdfIn PDF document text
    • https://jotelek.hu/files/file/80119094278.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708d5724075---20383275798.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9fef2643d6d33876aea64e559acce285/domozebonajuxip.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/c1f91a5bca33b25d2ce7866ea47173f7/81308384345.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/mawila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+hack+adventure+capitalist+pcPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 10948 bytes
SHA-256: 3a2c24ebfdfc033b0b8eb928f975436ab4c05e9276272697790a54a6de47617e
font_01_sfnt_off00012ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE3 16156 bytes
SHA-256: 7a6ed92ce6d2807ef50191ab1990c099939daaa25125a122e9ce1e169ae98386
font_02_sfnt_off00014266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14266 1800 bytes
SHA-256: ef03d06cfa822b307e6383a6e2dd7744ec2a3783ac5efc555ee6b4549ccc5fbf
font_03_sfnt_off00014ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD7 34216 bytes
SHA-256: 873160dda93d8717813446374a0b1be2a63d75267f032d7286b343f7999c81a6
font_04_sfnt_off0001845e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1845E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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