Malicious PDF — malware analysis report

Static analysis result for SHA-256 187832aff6258cfc…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 11:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1f899db6cc8626d2a04e3cd37d986d8f SHA-1: e4403d93d3a39b7fbfc6594fa98fe366029f9c78 SHA-256: 187832aff6258cfcea461237ec3ec3fc952e7df15079b1d5f1c0a01096741502
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=word+connect+level+81 PDF link annotation
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344fadac755---53311127506.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/vulivimawebaladarutuxigis.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161580bdf1e442---49599129586.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/fodiwexowejufixodevux.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/mujipelavi.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/1b25ed4fd66d6af4c99b4018482e0ae3/kigodivoxulaxubobopib.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/juxupotifa.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/bunobabazenufabazowifige.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ad2b64198652bb999f0199c366385a65/75188151134.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/lerajetiregixukuteju.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/velexurokawatexif.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/wulolimiv.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/zigirabofipemumesidumat.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161489ad686237---kojetusikafuxezasilexojaj.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/63496325961.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/butekol.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b23b0ab14db21e955a8041fb9bf0974e/85732117343.pdfIn PDF document text
    • http://bankerz.in/qpic/files/mupagatudaxor.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/wimoxabiragupitixugak.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/2118039516.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/56945861616.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/movasugusebimamuxa.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/judaxo.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/nomebapisazavopo.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-8/20210908140331914286.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_off0000b5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF0 10260 bytes
SHA-256: 426f186c324d25fd8bb5dad8b6a320c2a0ca2ec4ef6cd6b85fe4fc4f16b97ecb
font_02_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 15324 bytes
SHA-256: 22416e88a7feb1eebf300fd128d452bf261079f248bcaa627b75915a230410f4

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