Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35d52735495ddc7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 22:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 7382daa2e291ea8d62e818a2ff00b84d SHA-1: 1e7299ac3d50d43da76c2cae248711232393e0f3 SHA-256: f35d52735495ddc7043fad6a227dc29f74937d45ee70af087bd070d3c60a21a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9770

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://allytemp.ru/uplcv?utm_term=how+to+cook+hot+dogs+without+a+grill PDF link annotation
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/80a1319fdfca13a4e0d391db5d52460c/17404414642.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/46006740291.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/0be3711f3ad45fbb8f4465cc51133f61/20778473251.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161008c440c2bb---mijepojugube.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/bapinojopeposomujavit.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/97156528423.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/n0fg2967pscfbeh476isnlhe83/buvopojanirigozewopiweli.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/37a58765eeeba8c85b6f320a69e437b6/widuvoledekuxozodasu.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/verixuzajote.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/sewavatifujolow.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a92d74a3af3---55070975486.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cdd8299f4---mumoxilojanu.pdfIn PDF document text
    • http://williamshudson.org/clients/3/35/35bf74ce48b5c120232fd40fb4fe3e45/File/42452141742.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb841949e8---12538531376.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160782b8707547---nuwogedokuxezamimomitib.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/74882879835.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c1c7f647---6821436189.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0ldgl41400dam9irqblag1gm29/79057034248.pdfIn PDF document text
    • https://777mto.info/contents//files/disopoxefifepatu.pdfIn PDF document text
    • http://nhs-carpediem.com/clients/46367/File/54946600128.pdfIn PDF document text
    • https://claudiodituri.it/uploads/9744079167.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd5c8d59f9---jewujosalagisana.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/demepunufojane.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/wifukigamijaxafido.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/59abbe186aae2814db2c78e52127fe8b/9891971000.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 10680 bytes
SHA-256: cc6aad2801ffd324c4c9b81f1b3f63afd6e9eeaf7adc90c5414cd480cad28459
font_01_sfnt_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 18868 bytes
SHA-256: b1423fae6185a36e3393197b825125244b1a19a9155aafce88d038b90b21ffa7

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