Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8c305546f6e2d4…

MALICIOUS

PDF

85.9 KB Created: 2021-08-22 04:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: abbbc01743b72cdaae84c29515e77d9e SHA-1: 0eb2a018e398429da14664f51ec3574eec66e60f SHA-256: 4b8c305546f6e2d4d8331fbfc130ee74895bbc18797e7e1d74be96803140a0cf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to obscure the true destination and leverage compromised infrastructure. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=best+obd2+app+2020 PDF link annotation
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6ef344e827ba5b8348d6674861bb1c2/30411064691.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/ruvobobegopokejilig.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/pegedoxelot.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/vuvivesojiwobusasel.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16114524b58225---dubasipexapufez.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/ziwapob.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/parisunujewi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160772b743cf93---kutuforefikavagaze.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/78c1fb0f49b33550e23160aada78bee5/wefone.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/18218308844.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce48d00969---14492906654.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/ofrjh9d915dhjg5ttb20v336qi/jomitame.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/5391fba82bbda27764f15da62e2a5e45/63171182982.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/67307439679.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4873gitpv5t0srsfld402pob6i/dopivutorud.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/88547409618.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/gfdiqal865kr6nvsv4qb3l1964/9306770471.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db609db736a---wupavozako.pdfIn PDF document text
    • https://samowar.ch/upload/file/sixesisalezixoripawi.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/lazena.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/p5gieerijrlauq4b153paiajmb/44398437478.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be185b4fea7---52751045789.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/84867467680.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c247fa5a169ce9c89d11daf8a8404c5b/lobimulem.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/49629578735.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_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 10476 bytes
SHA-256: 7ef46d2bedb22c7a5f8e0465881230096ba95d24ce931ee683a3860d6a0c686a
font_01_sfnt_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8A 16716 bytes
SHA-256: ca20856bc10ce3039a0eeb7a23f6b4956062c2f7032e772de2faac4e8646f773

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