Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d428e17bd71434…

MALICIOUS

PDF

178.9 KB Created: 2021-06-25 19:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bccbd8def2f5b43fff62eaf09361f480 SHA-1: 8b771b2e53f2a0ca94bf97284cec38c230734b93 SHA-256: 51d428e17bd71434af6583085d2c0ced6f598f57de28ef190d936f7b2a043fa5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external malicious sites, likely for phishing or malware distribution, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9203

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://crysiq.ru/uplcv?utm_term=i+fall+in+love+with+you+every+single+day PDF link annotation
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/ecf13faecd85ca09fcb8bef7dc654e90/rexezeresusebuwirub.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/udpe4pufuullvma4vn4f8u4l0p/pujinapigukewuvininizut.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2edb3dee96---duzobinifeluxufekij.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/96583395414.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/kemebokolajajig.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/733c8f9f7bf977fa751e298d68fd71ff/dalatujovilibexo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6b5c51a91---xidiwezolu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/27666557437.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772cd37b0f6---52386122770.pdfIn PDF document text
    • http://ridendo.cz/files/file/vejeg.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/cb9837d825463dac9127ab89ccbfbeda/rejonuvusatomunifabar.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609487671fb3e---1288170462.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607715fe094d3---24413455404.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077b85e19cc7---jipixewejafebovasi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886f4ea2476---xifetetigud.pdfIn PDF document text
    • http://4bx.pl/public/file/98542846390.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ea22daaf75071ce1a67baaab10ed1b73/meperetilabidikitolekaro.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ea3897ea3---pojejakilukufusevum.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b708de96357faaef941698531a09a969/81094034566.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/c7j8sau19ih91r6s3m9f3a2n18/rewozaxobejiwefaziru.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/df4ca71840b39cd02af6c1dc0cc332cf/87036806035.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/50795969650.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/e85a5f62d8985ed1b58062e6b3852ff0/15965750809.pdfIn PDF document text
    • http://sns.hu/_user/file/bomekozejezaxurelidezano.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/plfa25bp9bn0idm7cognmde3bd/63097228609.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0efb603d89---29184669729.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001af2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF2B 10952 bytes
SHA-256: d1e61cf42cc3d69a1a8b690886821116a75936850c0dc304dc2b1c35385e5fcf
font_02_sfnt_off0001c854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C854 18104 bytes
SHA-256: 3322d957b43c8743036110507b01a39f7ff17022f16760356bf2fca2840c4177
font_03_sfnt_off0001f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F81B 77256 bytes
SHA-256: ea1ba57e25d6e063127544a6f7f3855801689efd45ae5b5c072bf5b98fe162d2

Open this report in the interactive analyzer, or submit your own file for analysis.