Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a6e308c92024f6…

MALICIOUS

PDF

88.4 KB Created: 2021-10-09 01:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9b0107b064512ff14d177abb3bf13c88 SHA-1: e2baa49fae42554fe7eeee4510ea7946095ebde4 SHA-256: 03a6e308c92024f66f488e8c03aeb37d4e67bf4e1f62c97c505d8c2da12e671e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised or disposable hosts reinforces the malicious nature of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://jingkangchem.com/upload/files/gubadisabovivibalirorug.pdf In PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/wewopol.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/bukofib.pdfIn PDF document text
    • http://farmina.ru/uploads/files/60388720674.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/44143391194.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/remosarefefamexavipin.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2da833395---fajanedon.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/af4b2eea8cf1fa7d37e2789dc81e9f71/44279345977.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/76327274048.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/regedituligo.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/zixoxik.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148005a5f462---65744845428.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/22977185031.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba47a51aeb---87096316633.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/49642840548.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/zawiwabevenati.pdfIn PDF document text
    • http://inica.org/files/file///lezazikilejetak.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/07082012668.pdfIn PDF document text
    • http://turatabor.hu/media/kanakubedikesogaligatozin.pdfIn PDF document text
    • http://rsst77.ru/upload/files/volubumowukejofatodexeg.pdfIn PDF document text
    • http://henca.com/files/details/file/saxugiv.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/98633325432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cats+hissing+at+each+otherPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 10496 bytes
SHA-256: 8e6e5881235fe5d8f3bc99ca93a53be4a8ebf25b1adccfa83d23212d46c210f2
font_01_sfnt_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 17824 bytes
SHA-256: 81633bab3f761dfb27922105499b2017258cc95a9c861f48e49b426d572c55a3
font_02_sfnt_off00010d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 18040 bytes
SHA-256: 8cb9847428ee2fe36cbdecf2c404e368c359beba5a6b1f09bc91e427fef38df1

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