Malicious PDF — malware analysis report

Static analysis result for SHA-256 678c3cfdce5ce2af…

MALICIOUS

PDF

83.0 KB Created: 2021-08-11 18:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c0e5a04b8023cb20e89a0974fc4b72a6 SHA-1: 10c29a34b87404276a92635d34ed415541618622 SHA-256: 678c3cfdce5ce2af07e7298f221ac2f879cd9ca860bf21f8f0e08a28a5e1fdf8
156 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 functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely to facilitate phishing attacks or malware distribution. The presence of multiple links to compromised CMS upload directories suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a26741075e2---zopimeleguduvaxibajimepif.pdf In PDF document text
    • http://csc0451.com/userfiles/file/20210629071457_ol7900.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b06c71b11b---35725441749.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cfa0dbb17---joxomofadumajodaxe.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/182b19a0524e4792fb2cdd3002a68291/97735597642.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/porovon.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ddca13a1ad2---rinisezidipipigulixulerit.pdfIn PDF document text
    • http://jar-ted.pl/file/fevepe.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/tikajurejurudotelo.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/28361262804.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/zizupuzawasisof.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e79d170a96---44925490867.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/96224882637.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/86329229418.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/nd2k40v289ke52pcqo5qkcps95/50405919871.pdfIn PDF document text
    • http://apvn.info/userfiles/file/fedikemitafunetatavakami.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c53a6e1104c6b0fe395ebc5d94bf9899/84148556035.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/guzexibamafun.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b995bf24527---73663159703.pdfIn PDF document text
    • https://irantruck.ir/data/file/toberiveledut.pdfIn PDF document text
    • http://www.toptehnik.si/images/88241996942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+use+code+search+on+philips+universal+remotePDF 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_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 11024 bytes
SHA-256: 64b938897cd5307cf75f294e31e9bb1c52072564bd2595484d3e0b1b78f665d9
font_01_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 16864 bytes
SHA-256: bb90ac8895260dd8cbd2c92d39344d1befde2dcdb559d6d957401fd2e57ffcc5

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