Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d1fa70a7cd2b75…

MALICIOUS

PDF

68.6 KB Created: 2021-09-03 03:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2acf6d5fc1a46d6b976af1b3bf0d2bb8 SHA-1: be46bf9865020609846d5277cbf9403111c4e0cb SHA-256: e1d1fa70a7cd2b7537f626a91d13bcfb65da3d4ee8768acdbb501fd51c70e2d5
156 Risk Score

Malware Insights

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

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 disposable hosting. These links likely lead to further stages of infection or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ddf664043ca59e99dba040c7ecfc15d2/43677505842.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/it05vfadmicq7fs8h9f3pt1tv8/50883346711.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/bmq1f30r975i1ebd8pdb2uihi5/87785070639.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/surabafujajiduxufikezeno.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/vavededuzitelewamuva.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607907a0da58b---90513939639.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8e114419e8174bcbb129aa1a329b3da8/27730530587.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b081aa8c---fivenuduwowajukakika.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c534fd423d---mutulupokepetefej.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/6c87148b707ac8a92b753885a204f49a/majevitemedika.pdfIn PDF document text
    • http://bienbao.org/uploads/files/11026293354.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/12684411089.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/gisuzu.pdfIn PDF document text
    • http://talleresjpg.es/img/file/61467523562.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e7e900e367---fadaziforap.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5f0decc2---90506199074.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a34fce7c056---26274088411.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/gelaxibupojufugepopivaz.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc854c0ad4---mimufonebebez.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/duvafexi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c078ba934d0abdbf306f28a915d91b7d/34457905711.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/35225755898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ugc+net+paper+1+mcq+pdf+2019PDF 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_off0000af7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7F 11152 bytes
SHA-256: b57c1822b6714c77b6e99968c88a21ad702d041deb1da6ba23e6cfe077e57bfe
font_01_sfnt_off0000c924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 14688 bytes
SHA-256: 279a2e098b11c2fdd31badd8da4303812aebf99a38574211d3766d9a1262fe7c

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