Malicious PDF — malware analysis report

Static analysis result for SHA-256 a419cf2786bf5b0a…

MALICIOUS

PDF

77.9 KB Created: 2021-08-12 03:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 700e5ab1ed9771b7a637df3b44465647 SHA-1: 70a853caea80d553642e0c4a800a853078d7dda4 SHA-256: a419cf2786bf5b0a3a92f8da43f4bf01ced432cb1bc6a8288100a5322fe5c806
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://a2itsolutions.com/chop/multimedia/userfiles/file/73865388639.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06db58008b---makarisafitulu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160940cc2afa38---xesakifubi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b605cd51661---vitelitatomog.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/baxisonibafu.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/kirefatexiwozek.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/miburef.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/kudowudiniduwuxagawofijaj.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tj8e8a74hu0c5cpi2gd73u6ddc/vuwesudujazalokipo.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/55493276729.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/fiwewepoputixomilosa.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8f4389e91---ladajizuvategipabesumozam.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/rifokisobosiposag.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/2laakn07ntkpoct1l6ld8qgpj3/kaganubeburimanu.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/49089238714.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/jifegixuretaramivapi.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/49354395630.pdfIn PDF document text
    • http://bptramptour.pl/files/file/sowapiriberuxukud.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/65358c48f6ef7bb37cb236132f5ba654/88291187196.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161083d6429800---pafuvavogunexasopubede.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/bgrn17hage29924lonmrev841o/jokodizulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=wordly+wise+3000+book+6+lesson+11+review+exercise+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 11372 bytes
SHA-256: d1960e8ed76aa5bd9d394adbd20c071004ed7fc43a9696555c5052cd203c7e40
font_02_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 16388 bytes
SHA-256: b130bad6eafe96af7c817ce46c72b26e8af6acf72eef1179e35f4d6c7b95c307

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