Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2d27102d7894fb…

MALICIOUS

PDF

82.2 KB Created: 2021-06-29 22:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ad2abead3c46171c2a49bc62ac6b63b SHA-1: e2f0cfe7071f554c547fa029b8ffb7d0fd72c7f7 SHA-256: bd2d27102d7894fba8231818038f4576838da8d88fc45c5d608e18c3f2fafd50
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The document's content, though heavily obfuscated in the provided excerpt, is identified as a lure for remote support tools, indicating an intent to gain unauthorized access to the user's system. No scripts were extracted, but the presence of external links and the remote support lure strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://synerhu.ru/uplcv?utm_term=gay+hairy+doctor
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe29506749---1186691075.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c295db013b2---kigobafojitog.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/49e9491555248c6893d3762fae795755/pogenarapudofifel.pdf
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/botuvopeledapemonabifozuf.pdf
    • http://apexibd.com/uploads/fck_uploads/file/34653360523.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607b905e14422---43892656102.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/o5j5dsvpiic8k6ok4hcae9j53m/34942890035.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8grj5ovotrprg84bd6anj2su60/fijivab.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cbc00cbcb---9075362014.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c557650a---67040639223.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c20273560598ee6489e974c5e94d2402/toperutilevekapa.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead9726300---vivuxilidizutexixu.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607588086643a---dijeveru.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/fbc5f30ee4b0d820dc07565eb62106e8/45931106443.pdf
    • https://isosklo.cz./uploads/memawanudividuf.pdf
    • https://perfecthospital.org/FCKeditor/file/21072730912.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609416ee1ce45---luzogumefopulokil.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac066da10b---23357433627.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/a925748aa984083443e572ac804cc511/57952608194.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd1.bin
90c15cacb3837f1cf52eb7bb53b4008df8e1a5052581df3dc233b1f8d25c8480
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 16868 bytes
font_01_sfnt_off00010bf4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 16792 bytes
font_02_sfnt_off0001240b.bin
40d8ebb509fc033ec13c60b9cb370ce9a1412b9adf74a3ec4590eb95bb231b20
pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 10172 bytes