Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f15a4f7d941cc20…

MALICIOUS

PDF

87.7 KB Created: 2021-07-16 19:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e783ed1ed93aeb8e1de751e8c6fe457f SHA-1: f10b2906fe6dfd6438774ca82314048903a5130e SHA-256: 7f15a4f7d941cc20a3ed009e48aed652f3f1921bdec9128c22c7a6cc389fcc4e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the PDF structure strongly indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/734fb4609e2103ad78579c0b7817a218/zixil.pdf In PDF document text
    • http://instandee.com/Images_upload/files/44410064465.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/juzomew.pdfIn PDF document text
    • http://teplospectr.ru/images/files/wilexuretikokafafirik.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/67663231302.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/15920288513.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f4b152956---papigoki.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/04npmssarnfvp4v0fdt4166p4g/5775078124.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf7301bce1---lizunajivikinepa.pdfIn PDF document text
    • http://phanbonvbm.com/upload/files/56290168815.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/guxuxiz.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/91738343497.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/c4889ea96053dadd8d274c5c1bcad798/63994908448.pdfIn PDF document text
    • https://ptogel2.com/contents//files/30274060314.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/judivun.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/84944254563.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1370f6e617---21316789905.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821fb8dfc7b---44617531704.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/99708241330.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/90d477ecfc54583d83e23142b6fdf44d/sogejugebolapipevazoruvod.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c815eaef38---nebet.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6b8c730fe---31738576277.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/fbdb4580fa69ddf25fa5c0e14577dd7d/povokoj.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/05b560aa90a606e16d9ff8c9928c156b/tezazutijemotumitubefu.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/90427009603.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/28f1b772e0f149e85b70e94837b53e28/11166527186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=large+depth+of+field+aperturePDF 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_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 10564 bytes
SHA-256: f5d1fe84cf18d23a3221d3881d3c3e9fc0535185046894db0a68bc4904234b51
font_01_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 17544 bytes
SHA-256: 6b3d20b5d7d6bce406d27a93cdf5eae624fcb816af05e7aee03e741f3fa53f39
font_02_sfnt_off00013953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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