Malicious PDF — malware analysis report

Static analysis result for SHA-256 245402291e23e006…

MALICIOUS

PDF

149.7 KB Created: 2021-07-08 06:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 51c75f69de1b58572e6ea54eddbbe672 SHA-1: 9f7feab2e06ee7ab7ab8a0cce418e8ba25f378d9 SHA-256: 245402291e23e006c68ab1d198413f711f9531d14b994e5910766334d4ba496f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oxi-dental.ro/imagini_ws/zinawiroximenise.pdf In PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/6fa4f529c509e6af527c0f1e6352e0af/14258746191.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/gafidonikopinodupe.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/mirimikimikezepitaj.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/acj6ut9atgpltq62agk3850hlv/sepobanozirowotazu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e6bace76---10337970403.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a71f157f5---xasibajopudalos.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/zomevodo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/20ac02b666d6c2fa9034b8119ff1f4d6/sudewoxetekimulaj.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/67su6ntalh9odc20h7mldc5u3f/2410834848.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/66319ac7f16230aba67bba049d5ebf6f/5073849694.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/64775899100.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/tujuderedobunarakuv.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8ee6502794261b7ff43fbcb63aab9e8f/forubipuw.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4925cecdd31ee2c47a76528169635436/zuzibu.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216231651106967.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/motdcslu77ctsrb88ag7l8escj/30003372423.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/bozajaxe.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/49421636995.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608f682ed7054---35215146060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=limited+access+internet+area+crossword+cluePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD86 16928 bytes
SHA-256: f32b7bf8e9aa9a8167c559c8ad295b1f6cceac2fdf21a14f336c11a4363f3898
font_01_sfnt_off0001e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E601 10672 bytes
SHA-256: e3a3b3d276f83ed67dbc0f2c9307453bcbf06f9b802c6ff80025df6bf1f11f30
font_02_sfnt_off0001fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE7D 18908 bytes
SHA-256: 8fbc37eb16197ef7559f9a14401b9f90368411d2457c77c04854f4ed382a5cf8
font_03_sfnt_off00023083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.