Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e858c9acd436d8…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 00:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 773feadcf1aec3ec500c9df43d6a8c28 SHA-1: 30475e3415a80a99ceb65d6a6b8869889c7bee89 SHA-256: 63e858c9acd436d8b838008af2f88c4757ebaecea672649897b8f117a0af280b
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lead users to phishing sites or potentially download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=idli+batter+varieties PDF link annotation
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/75741536770.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b9d53e554---xilamux.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/libaxununezoxenarawexi.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/besutezupipinuvi.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/wiwoxakaz.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/dukoxebujimizufid.pdfIn PDF document text
    • http://zubrcup.by/files/files/28645072869.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/bidemurupofalasufizubut.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/53450903748.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/72231517263.pdfIn PDF document text
    • https://coil.hk/upload/files/mizugulikowenixofegalas.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/41332888004.pdfIn PDF document text
    • http://vladekoservis.ru/files/mamiviromenofisamataku.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e56985bec---kefabemipevafir.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210913000805.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/wewuxi.pdfIn PDF document text
    • https://506hlapeta.com/files/file/mosine.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/mewekagovajebimatebol.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/ginizidiruwopuxilegal.pdfIn PDF document text
    • https://esz.jp/img/editor/files/xirapasobexikesepes.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/c1ba7fa21c09f3d258ced61f96b344df/78934979260.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/62ee8e63896edfc04046628d65c9b635/lozedejudezunazewasodiloj.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/rumotedar.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/l9m8c7jp52q7m0i2vgvhphvgrt/93583320351.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_off0000bd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2C 17572 bytes
SHA-256: 480486c1448508f31030fdf8fbe3e88dc33e68d6df3a5fd5a59f7b153b4d8829
font_01_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 10172 bytes
SHA-256: 377b2ed35eed1f3a1b9756b5418fc9c79bee18d55a3fcfe7a2497e62573761f7

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