Malicious PDF — malware analysis report

Static analysis result for SHA-256 133f770689de6e61…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 06:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6947d7df762d31691aeebe8607e8e576 SHA-1: 169a98bd0e7c06ef798ac2dade76c075f1b0673a SHA-256: 133f770689de6e613d1ac0eae434640ca329969b55ce14c6fa596fce87329db6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into clicking malicious links. The presence of multiple external URIs and link farm heuristics strongly suggests this is a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://drafthe.ru/uplcv?utm_term=control+systems+technology+curtis+johnson+pdf PDF link annotation
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0c68c10aa---81541636352.pdfIn PDF document text
    • https://masihpt2.com/contents//files/95267134729.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/nikexezimatavosurobosifim.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6ce6c286362484b4e0183239b55c434a/2185580434.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/zazazuzobakoral.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608077cf59270---sanotazezebapukafirewub.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfbd9291af---46996339950.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/nqoiaae73jqk23jmn09990n868/32955638323.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/25700336481.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/xasijela.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/67029264752.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161139e899d37b---zajuw.pdfIn PDF document text
    • http://santeh.md/img/files/dizilupab.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/92575618645.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c1959b773---17312972944.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f7533a32f8886d8c21d58c5d9e2f3f85/botum.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/18/vuxewuki.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c480884f10---73105265081.pdfIn PDF document text
    • https://membermimpi.com/contents/files/25609343515.pdfIn PDF document text
    • https://reniuved.it/file/tokepukufasagopemedetowe.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/33503842441.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/79800775032.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da6ffbcba7---filunotedezadoxepesege.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/bubagiped.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_off0000c20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20A 16560 bytes
SHA-256: 28c3c2e6954a771ef91241ce33de2b4deb3e2a988c55be220039cb40b1392565
font_01_sfnt_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 11280 bytes
SHA-256: de6200a63c93701912bd9ba3a1e53cd7dc0009deb6af41558e146f6d748698bb
font_02_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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