Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3fc229ac7cc5db…

MALICIOUS

PDF

104.4 KB Created: 2021-08-14 09:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0898060d6e8f29667c75f1f39e9e31a SHA-1: 36b7683ebbd8ca95be91b5fb2439954cc241abff SHA-256: ab3fc229ac7cc5dbcace4957dbb40881d8d11336eb9629431658bea24cf58fcc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites, many of which are WordPress installations hosting PDF files. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://crysiq.ru/uplcv?utm_term=rosetta+stone+workbook+spanish+latin+america+level+1+answers
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8865e3c92---supide.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/627d4a8741c3d60c3c410174926eb312/ramukesarejalij.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f17be8333---jowoxogesobu.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2oo67f9us4cs1nr50m7smdatc4/paxusutip.pdf
    • https://suacuacuontoanphat.com/upload/files/79756496974.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d2a54fccf---jixavoxinato.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b6217fc4---67399630453.pdf
    • http://szzxwx.com/Upload/Upload/file/20216241757467269.pdf
    • https://abugfreemind.com/userfiles/file/89170909446.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/av8du1e0h3aveocaa4kora7onv/50548256242.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/66c65d3624862257b8e07054659a3eff/45253910559.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/raxexaken.pdf
    • https://sofupingame.com/calisma2/files/uploads/jomaseligesizujikasipa.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/3c6fd43a331b37420b0657a0f21b89fa/34389730735.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/jofiwaxokolu.pdf
    • https://alves.bg/ckfinder/userfiles/files/77930123101.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/evj1spgt3k46io6pp1o6v55dub/defis.pdf
    • http://ruihuitax.com/files/file/56409128156.pdf
    • https://tecnibat.net/uploads/archivos/ziwirixirulaxuf.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096545596b4b---xalikutilakemivopemominuk.pdf
    • http://519pf.com/userfiles/files/rebenubodizaferexokadal.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/gevobexozevezekaza.pdf
    • http://www.findvoters.com/userfiles/file/12322559842.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160730bb69bfdd---1119384773.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2ae686442---49167732028.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f7b364b17---54228962798.pdf
    • http://dgjst.com/upfile/file/jowuxoduvoso.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131d2.bin
ec90672766cecb83d92469159700b6a7e427e0453a2dfb9386d26c88dba97496
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D2 18008 bytes
font_01_sfnt_off00015f0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F0E 16792 bytes
font_02_sfnt_off00017725.bin
f989e031e49ed2590f7ff62ba3745987a21f892d99541089c481482854bf4177
pdf-font-stream PDF embedded font (sfnt) at offset 0x17725 11120 bytes