Malicious PDF — malware analysis report

Static analysis result for SHA-256 e046a0f165bc6ef5…

MALICIOUS

PDF

89.0 KB Created: 2021-08-11 10:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7298fa575246616dce2ce265e01007c SHA-1: ae7a0d649942960fa8c45381d3ff398d7d61c3f1 SHA-256: e046a0f165bc6ef537c469ceedf4adbb00ce253ed479c8dba52f8b36f68de72c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to external websites, including those hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://sindonis.com/userfiles/file/94194727192.pdf In PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/19130558583.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/zujegene.pdfIn PDF document text
    • http://chpcentre.com/files/file/jifonejenutatulid.pdfIn PDF document text
    • https://ewt.cz/res/file/34385809717.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/u1f7pctv94ksf13a3qhpo4kudb/fikagusuwu.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/5061076918.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825392e3eea---kaxaneguwisub.pdfIn PDF document text
    • https://ottopianos.nl/files/gogovesibaboxifujeloluvep.pdfIn PDF document text
    • http://ibb-online.ru/f/file/42079486435.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc4eed300---98328427258.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/zulovadobuxesipetunegivox.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/lazoxumororu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610269c8c9d6c---59828738631.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/3937a23154debf20b238f490995a4dba/kupizekinabu.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-4/20210604101129372729.pdfIn PDF document text
    • http://elm3rad.com/file/faridobib.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-3/20210503093227843775.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740ab3a5823---23259396457.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8684f32357---4228856966.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160838a7dddf0d---10904676225.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ph0q4nvirvqfijesq6jed2u2i6/52825760267.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16070af38618c9---felazugoropobud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=biconditional+statement+worksheet+with+answersPDF 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_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 17920 bytes
SHA-256: d81e909d269f1ffbcf35c24d1ae293d82a39c9630d404314afda741bc9d79c6f
font_01_sfnt_off00012469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12469 10868 bytes
SHA-256: da06ea4f99744453efb409419673df85540e930a7f98f1de292d2973d3175152
font_02_sfnt_off00013d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1