Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fca2e7b5fb49e4…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 14:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: acaee1af7b57d3635c9c2605b3630491 SHA-1: 9f249709e787180a7c61f978e58c88df53513a6b SHA-256: 08fca2e7b5fb49e4dfcee6b2ed7447cb85302e8f35a17c95d47d37b865bd0967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure indicate an attempt to facilitate initial access, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=khatrimaza+full+org PDF link annotation
    • http://www.agenbenangbandung.net/file/9691005694.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/dolewolabup.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/55425429371.pdfIn PDF document text
    • http://recviem.ru/img/upload/tititipet.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/tizobodetewowoxedu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9155eefcd---movibakazu.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210901_190654.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/jopurimowaxeralu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf577f0b0---43905510186.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/63966589717.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/fixiwa.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/fewikujogufulewerib.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/rowomitidum.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/nafiz.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139868fea273---77520360226.pdfIn PDF document text
    • http://www.moyekolodin.com/files/78325278707.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/38786970762.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/mavimanezoturo.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/vufaxekibopigan.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/gofog.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/82071517123.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_off0000c1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FF 16988 bytes
SHA-256: 65d8aac73479cecca5553663d6c48a4c769fa8f02e7bff701d295f4ef7eb8ec2
font_01_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 10408 bytes
SHA-256: 19b0d0c40fa163eb69ffe0fafeaff638ba09a03ba5d6e2928b08b484f947e318