Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe17aa9f2ff8d87e…

MALICIOUS

PDF

71.8 KB Created: 2021-07-12 17:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 61106e83449a4295b00e58fa5f187aec SHA-1: 150abf6b54e917e5d2aab031a47d9d273a8fa69e SHA-256: fe17aa9f2ff8d87e5c74ba0404cae3873e09e536471c80e9104c66a8201b0088
164 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, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=air+force+group+y+previous+year+paper PDF link annotation
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/xitenefex.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/3e365a3f0a8dc73be7ca7fd1bfeb12e0/71816662972.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/46027995424.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52365cd0e---sasegoxowufobavuwowikim.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/rojifudekopixikepo.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/numuli.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0d2bd415---27803823437.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb0090e32---dojozunabosaz.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2fa9323e7---74559682719.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/h5q1dmvhk866mdh7erk17h0keh/kemobow.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/64199761243.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/984ca8f8ff1f6bf7610086821d45c4f2/kujurenipa.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/66338205528.pdfIn PDF document text
    • https://stopserv.ru/files/file/69414897101.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b30d8567a---xavolonirumajitegitobi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160907305974e9---sigoranidepamizixabel.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/3k35rdovja3br0l78un2m7ka6u/99340211006.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607607432a830---92541331617.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecab8a0222---97941157695.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rcicld61g6qg1uj5ac0gemp1o5/javafajafuvo.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba31441d3ed---tikosekemaginafu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffdb8a2358---22203933195.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f7ed44eebd7ac678ecc98c1cc0644d43/daribodebanejuzedekuri.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/af1bcfff4f00b1264c58e8d2aa616365/wememusotojolasixepob.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f1e0c502f91c8386fa6b6d9a25f8ff3f/mopubokigolugigivawati.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/kevoweworo.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_off0000b97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 15408 bytes
SHA-256: 35078d7534a9e57463826690063c097e88726550707e76d3a1eb780a28382c4b
font_02_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 10668 bytes
SHA-256: 0093b1b2cf5632158d706a203f06059066589fe16cce3f3fe9600e1072ed4e8a

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