Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac5decf28ae3eca…

MALICIOUS

PDF

83.9 KB Created: 2021-06-27 04:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0395f788bf365ba38a1efe24a81fe473 SHA-1: 03fbdf9500f3bf3c692f23f0f4dfbb8b51e5daf8 SHA-256: 2ac5decf28ae3eca7f9b30b302faea21cbfc9d6e6805064160dc13836daacc0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2620a0b7f---59998079674.pdf
    • http://slp70.com/clients/873855/File/18026277178.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2006332f03---47290837455.pdf
    • http://www.hangmandigital.com/files/file/lawotaz.pdf
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/32769675549.pdf
    • http://omegapizza.net/uploads/files/3206162680.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607754bf95372---36937255042.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b37d9b073c4c767e66035187674bb2ed/30594219038.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7e0b2f1be4d89f8210dfddbf43bb181f/17969168200.pdf
    • http://icltindia.in/userfiles/file/91268691838.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8a161a2a1dad72362d4023e6a7dbedea/xemowububebotepokun.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/bosekegekuditenovilekaz.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pf55d6q3a16i4i892nmgfhu603/8725311269.pdf
    • http://palenice.net/obrazky_clanky/file/73382864434.pdf
    • http://malbreil.com/userfiles/file/81300522691.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca28cf0a68---16885625862.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/49218898305.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22b4aa62b---forogidujipubovu.pdf
    • http://chikatere.com/Upload/files/gufosidudi.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/842f61fddbb901721e09bec7b864a791/vevagefageburigivewuz.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0db258501f---vipuzuzugefalutugoxesebin.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c7235c1ad---wisefuwen.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/jj421etgskgrpmaj2rf3bqtao8/sevix.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/f37n7ak4nqsclbrsuov2p26ns9/bamalabim.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=building+act+2004+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_off0000e59a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 16792 bytes
font_01_sfnt_off0000fdac.bin
6814a0432091fe82c0b4efc031f1eebfa1bae81ca04a445770a993fe69eb9dae
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 16980 bytes
font_02_sfnt_off000129e6.bin
3dfed486c09ee92074b4b05ce9437840d5497aa409facf8ff8b4ae0f29609eb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x129E6 10748 bytes