Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37ce22404370aad…

MALICIOUS

PDF

76.1 KB Created: 2021-07-01 19:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ff92ee2a87ab17a1eb904880f885266 SHA-1: 3793d26cf98aa7248cb6d079044ec0d038cd07ce SHA-256: c37ce22404370aad38e4ed391af9ba5f64b9cd74060276b5a6d898a62b50a63a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=resttemplate+spring+boot+example
    • http://kayamedbursa.com/userfiles/file/72442992136.pdf
    • https://sakkestadbil.no/userfiles/file/81783788357.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4700093f8---46286946744.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vo9sktdkc2aj8m4cn6flphvuhs/35729210427.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/4kjudj93s29ctenhp38kmnj9qu/53754179993.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160841e0e936e4---gazexoz.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbcbc3e761---31023231513.pdf
    • https://saunadlaciebie.pl/userfiles/file/81900004793.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/8uc24lbgjnuvg15ene2ff7t1ek/83709667009.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be803c2cb2---duzokuwuxevopevesajuve.pdf
    • http://peneleos.pl/userfiles/file/87702728999.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d729b2efc---96763370497.pdf
    • http://lycee-elm.org/userfiles/file/zevebobesekejito.pdf
    • http://griswoldremgmt.com/uploads/files/sekijesiwukulip.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608629d9e37b9---wodezusotomorevu.pdf
    • http://bmsorganica.com/userfiles/file/ramesezesakemefobagenazer.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/754da01b45398d50388c1fc4fbe0f8b2/95543171355.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j6n3onsca1l33vf6oj4rtcsu12/26096387482.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/0p2abms33iv2mv5f62nc03d3as/katudimatajaw.pdf
    • http://aarogyamedico.com/userfiles/file/24835801772.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a833269ca8a---65010427221.pdf
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/17421422b26df2628a02aeef8a865415/zufovodo.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_off0000bb24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB24 16792 bytes
font_01_sfnt_off0000d336.bin
4f19541a45ba4555b3dd773c5b4184ff94db214f46ae085990c62c76fa43e732
pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 21452 bytes
font_02_sfnt_off00010836.bin
aa94f2cca4becd34c0df7150fc9b8cc145cfc5c27e056b1a780257d6b7d225fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 10880 bytes