Malicious PDF — malware analysis report

Static analysis result for SHA-256 895e653c65757244…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 12:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2f92f2f76e4d0cd64f41ecd7f262bd8 SHA-1: a563dbee20d99cf8f7f28288978ff9c704659bff SHA-256: 895e653c65757244c394997e0817278d103101b65c45e117b93d8620251597b5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites and disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wita.lt/images/files/43303487898.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bc1a86268ee1057554f878dddb77b1ee/65268520932.pdfIn PDF document text
    • http://domplus.su/userfiles/files/xifijagikabumi.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/54428999418.pdfIn PDF document text
    • http://emeat.ru/var/files/28953239655.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/63542891679.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/lomadojimixodepal.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/71299755122.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/38327025245.pdfIn PDF document text
    • http://eksternest.be/images/file/73083320880.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/70268332447.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/xalupobu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613433b458214---wavax.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/sonuka.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bf17c422432c90dc0b795a9235686a01/kurivobe.pdfIn PDF document text
    • https://cakkue.com/contents/files/biboxafagamud.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/60581243425.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/tqmiqlsun54fkfhcnb7orkhacr/fipum.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/90493982253.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/656806d3c0e29934860ed0a43080c24c/satepebepurijumupu.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/17414154575.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/mobufitijevogovipesum.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/51676287023.pdfIn PDF document text
    • http://schokofontaenen.de/idata/83652704931.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/35583295586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=moto+cool+mathPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 9892 bytes
SHA-256: 260ccf589ad11214e5de5a227c0bba592ad2bfc23e29ec41b50fdd92da1b91c8
font_02_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 19308 bytes
SHA-256: d92ed3cc6e146a057eb4cccfe67f4f5d450653c209836c0fe2e3d4d21eeafccf