Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74bc52a17be887f…

MALICIOUS

PDF

89.2 KB Created: 2021-07-03 17:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca98cfe1977fc83e2e9e4094f359d4e4 SHA-1: f67035b5875b0189cf90606583866f2ae3b0efcc SHA-256: d74bc52a17be887fe4e274839dda76a1f44f20075b1cf9bd7602ee53e572fa65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. While no scripts were directly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e6bbcd3fe---6427610941.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd9cc0b1d---48893059288.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39f04531dd---wogegolegibodedabexesi.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16095d2d740e05---paledimalatizefi.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nteu9fh71ijnnvh24f49u8kik0/nesusejesaripe.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e30c33be035ac3367fb3ba2a2d942b02/pusevisapi.pdf
    • https://growyourmoney.in/userfiles/files/xodomabag.pdf
    • http://adabaskimerkezi.com/upload/file/xigisinegofefibikobi.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/825bb2f31db5addfe37f3062a459c677/mavuw.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/dc5559pkbd7cgvdfqkeguj86km/mofugonorofefirakonifa.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/3oirbugvorab0sntpjuo5ivrdl/pobarejimelolupesutog.pdf
    • http://nedirajtebosnu.net/userfiles/file/1734983893.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b85e5d3f6---lupenesepivubikuvokesuxe.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607297aecbd5c---rapiroborip.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccb5498fcb---darevumozuzoxeligavano.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609688a641d35---jezizasab.pdf
    • https://barcelonacentremedic.cat/files/galeria/files/98007537858.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890f4d1a92a---53566613770.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160775ef5b124a---zulipipumod.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60e35b4e1e---53824967376.pdf
    • http://datavincity.com/uploads/ckfinder/files/83584967895.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/f9j3re0641av07s7r51qok6p15/bosefusotupi.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c02db083---xumiropudozolipajijube.pdf
    • http://alnoorcity.com/userfiles/file/41827345488.pdf
    • http://alhouti.com/userfiles/file/dutomitamumipudezazer.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dance+trivia+questions+and+answers
    • 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_off0000f719.bin
626aa54581f3294925d428c0f557d8a53463aa111ca41788f24293a4c198ba83
pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 17508 bytes
font_01_sfnt_off000124fe.bin
47b92596bde9057381936d8baaa594b8e62370115913da7ce0ad1b2dd84f3010
pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 10716 bytes
font_02_sfnt_off00013d9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9B 16792 bytes