Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18f3c95b7e7f01e…

MALICIOUS

PDF

122.1 KB Created: 2021-08-18 09:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ffe7408308fa6f31a660501bb6cd1ca SHA-1: b81af16dca575c1c411d84032ef69c1aea154fe5 SHA-256: f18f3c95b7e7f01ebae1f49efe6bd6276b3ef48ea7c1d9ae07b1099074b0cf45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely serves as a phishing or malware distribution vector. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious payloads or phishing pages. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://reelproductionshd.com/userfiles/file/perifeli.pdf In PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769fb5542d9---vipunig.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b57be94cab60354d468e5e2acbdd6935/42590241157.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/81284573183.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/87199863886.pdfIn PDF document text
    • http://sun-eko.eu/files/file/13589079887.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/53qqth0omju40va9l30l9iq2m4/xibanojipov.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/rufubalojukuki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95acbc1c79---mimananagutu.pdfIn PDF document text
    • https://room12shio4.com/contents//files/74819213324.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2bb060c00---97439823845.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/kezirikitoxexuwuzabu.pdfIn PDF document text
    • https://qnzar.com/files/reguraziw.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1735437af---tuzovoxofewalugitonalulom.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/puratog.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609616db2174d---gubudijiza.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/32938096481.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/70597813706.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/86119299895.pdfIn PDF document text
    • http://parfumkin.ru/files/files/89697218338.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/35530941014.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9aeceb682---75978223050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=asturias+guitar+duo+pdfPDF 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_off00017304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B1B 10472 bytes
SHA-256: 496613a6d8d0ad683ce619423ea63944a5ae29e6cb7e9f4c3f517b1f3b30f21e
font_02_sfnt_off0001a2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2D1 20920 bytes
SHA-256: d96138fdd7901a23002718a7f681e6891b88b89cfa1f59edc321130c06c3a41a

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