Malicious PDF — malware analysis report

Static analysis result for SHA-256 9557c6fa7d93b86a…

MALICIOUS

PDF

88.1 KB Created: 2021-06-29 01:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b271057b5d2cad8edd7652593c775bbd SHA-1: ce172ebe1066700f51576cb1914f9702c41bb7f9 SHA-256: 9557c6fa7d93b86a21eebfb5feba9b2f6273aad05c95e8aec3dc4fb2017edf5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm indicators suggest the primary purpose is to redirect users to potentially harmful external sites. The document body was unreadable, but the presence of external links and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://irlanc.ru/uplcv?utm_term=the+lady+or+the+tiger+test+answers PDF link annotation
    • http://2990592.ru/ckfinder/userfiles/files/44412755916.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607892788aafe---85169378354.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/zomijegupuguzigajeloginu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160828a5d1f60b---89232909576.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/gegesirubowulofu.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/17233116461.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/1222830894.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dd360046f---75387534249.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8362de42822a5bac38911a1a56ac2aaa/zowujikewigutimejarevikak.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/767d96b8d9f21c3a48abe2fa55c7ac7a/xezejobu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hdbad3vo8aejsta6clptoj3jb7/33005105045.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/pigufoxaw.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/63170204492.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/pogata.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/987efb063b4363ea4030292273274ce8/28516273928.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/rupolopeb.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/e1c7773f9672a90e9e7b02eec214d43e/472598888.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/5944ece4164579ddf4dc18ffb5682d50/tewodajubopifi.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/g3m458aj0je90k5ku99ceefij3/divozuvolamo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf6e27a959---wubosuloratowuto.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621878272.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/e675f72109e1bdbb39df6013fbc1a229/zokudomoxeporure.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_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 10688 bytes
SHA-256: 085566c20733b573aa226764be4f201e836a713c2459f863d6a141c20b4d59c3
font_02_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 17376 bytes
SHA-256: cc19f7d8c9089658e72a219fbef67c4cd03479a82dbe902a96673d68ad7ac4f2

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