Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e1c8de29e8d125…

MALICIOUS

PDF

81.8 KB Created: 2021-08-21 00:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f23afb50a47c3d4a3e9cf2f40f5e7c92 SHA-1: c86d7cdb8726c4191b4baa10d62f52789bec1fac SHA-256: c5e1c8de29e8d125062fa3df9f70a1fb07360fe9893df5c40f8a8580f424051c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of multiple external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8bcb9832---jilafifizotivewosatinub.pdf In PDF document text
    • https://alsultantrading.ae/userfiles/files/637523891.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/22732543567.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/9chprkesk6vndamjndkski0gj3/40741022814.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/kijadaluzajegiw.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/botukupimusi.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/38038730063.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/70318360383.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/revotunexegafigelidezeso.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160813e2aae33a---bakagorejirunananufudinet.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/84927510523.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/02f35641916fc324b36fe878212a9449/79276144558.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4a72b9dc4---zolopevutegivodor.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/01b20aae93b589fffa4f96d76f310e03/25631812153.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c003d81b3---wudunaraxod.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623603113.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/gitavutuxolib.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/bokutasomibijare.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/kadujenuketekibadutej.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/wazese.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/faluxirel.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/14786659811.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/gosapiledax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ego+t+cigarette+electroniquePDF 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_off0000deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 16604 bytes
SHA-256: af3620546daaa8f120724e673a90f76d602fe98d7323769b02a918c41534f838
font_01_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 10464 bytes
SHA-256: 2eb34c5fdb85349d06e910b6bd3d35d0e335b9c38959198deb2b970b8cdd59cf
font_02_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1