Malicious PDF — malware analysis report

Static analysis result for SHA-256 31786f396dfde9d3…

MALICIOUS

PDF

70.6 KB Created: 2021-09-04 18:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e98b64d4fd45002e2e742c4fb8ec411 SHA-1: 1ca012eba43a18d37715f29ed67f0f0d2f5bbffd SHA-256: 31786f396dfde9d30ab15b437b7c624a88ca31f95fd0248e220be0058121e252
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=domino%27s+pizza+training+manual PDF link annotation
    • http://studioambienteterritorio.it/userfiles/files/39574776680.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/35831138861.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/bojuluximababesatomi.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee717589b3b---modedumisituserime.pdfIn PDF document text
    • https://ijpdua.com/contents//files/81777648155.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/62181418034.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081b7aa04d2d---visavupawiwe.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103a4ad80280---sepesuvokakedusajitu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70c81e86c---kixum.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5e937cd02da69aafaab450ea33dac256/10963369678.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/c9c0191fccd168cc31654d8f1dd1ea59/94912204628.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9d9abbb3c---9793277189.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/buletabokib.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/nalozes.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/zarumutil.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/tupove.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/15025804996.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/biwanaruja.pdfIn PDF document text
    • http://superazs.ru/images/news/file/juwivisadamumimuf.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/zopokixagoleratujazajavu.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/92668466820.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/a82h8be40dlndd2d9cqh4givc1/83713615825.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12cfde904---82361096401.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_off0000b4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EF 10656 bytes
SHA-256: 120849fa1a62ee25c3ea7255d5d5afc5892b1b5ae7deb8b7bdbe2cb925e13f08
font_01_sfnt_off0000cd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD61 15580 bytes
SHA-256: f3a254a4166544df1417fab398e74925e14a92c436d9f8df4700e0f2d3b9194a
font_02_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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