Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fd7ee50cc65640…

MALICIOUS

PDF

109.6 KB Created: 2021-07-01 18:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b0364bf4c1d3a928dadbb10731e575a SHA-1: 6222a5a20a62c63143b74a05f8435c7d1d6052df SHA-256: 05fd7ee50cc65640867aa554264464611f4bf66a22aaa003c139f104fa5a0b01
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c635818b9c5---tokedupogitilum.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/57d13ac15c354ec05fa171f3faf004bc/sarabajewixoxewanite.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/52b9b3c642990afab2378a59991d5e0b/jokowozorirefopuw.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/33714e4beb1c39be8fead122eb0274db/53344903318.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607396069d087---kibokuvizifo.pdf
    • http://www.sudaff.com/pics/file/6252212960.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c598fd3dd5019e4ef93ce143f333e567/towevamofavugesefalos.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1995fe0cbe19c7525170ab04a017404e/86760504847.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a2b33ca194b16cbbeed52f94fd7934a4/rawevibiw.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2db998467---wozibodefigaletojux.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e029a461---zugezenatenopurelut.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a293f0d3a59---wapifefexus.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/92439536447.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89d06396a---45613155857.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b72967983cc---87422370848.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/d0garfcrkq5ai6kvj7c0609je9/37607163067.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/qjn8n9kpe13aoq7qut7rdhf8rd/wamuzitovare.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608767838a5eb---63982029951.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160836df274ab4---lunitavadewodesujupi.pdf
    • http://www.herbertvanderbrugghen.nl/draft/tonakebip.pdf
    • https://perfecthospital.org/FCKeditor/file/35690039764.pdf
    • http://www.heksan.com.pl/file/19714501651.pdf
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/69290449573.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d7da2ded9fe---1722639255.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160842c05f1061---98562426071.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tqm107do1gpban4p0b3atguk26/23487327489.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/bavujewidefov.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+model+millionaire+long+questions+and+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000148ab.bin
d73a116a545e8492439552fe18ff982abdc4e0b3cabcec8d4ed4b70264204838		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148AB 11240 bytes
font_01_sfnt_off00016257.bin
c5f5844fd4f54f6ab84d15deb4a03b2736a95763f4b9b4fb8cc5c24607ad1c4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16257 18060 bytes
font_02_sfnt_off00019195.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19195 16792 bytes

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