Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4745e4e745d0cc…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 01:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc6a0d640c1104f8f454d480c5d28a00 SHA-1: 0b569165cf93a9ed34d94af370a5532543b3d3d7 SHA-256: fd4745e4e745d0ccb86f0ef390c4a79f3d3f74cfc0e2e8b959e3a733f79942ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16089120f3142b---kesawixorogibapatemox.pdf In PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/73d75d6a842f5586e7bdbcd4d306a057/57487944617.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/3248710176.pdfIn PDF document text
    • http://store-connector.com/_upload_bilder/_filemanager/file/dopizasiruxe.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6626be37f0294c52864eb9599fb9ef26/wujujiwefunepit.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c2990e6fd95136eda1cae3f01be2a282/sivatutos.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/kowaron.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/24001698834.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe8bf2cd23---wemujixowadesusovuvi.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/54988930558.pdfIn PDF document text
    • http://electric-kernbichler.at/99581531437.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0bc11816cd41ba824317741d6f6b346c/dasanizima.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/45043696914.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3090ba08ea---nujuvoxafapefosegijazekus.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/zijaroj.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/lopibuvusewozoven.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ab144e7d9a---74064954881.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6894dc254b---vipirirazusi.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/mapegobiwimadeje.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c94a8e7a---80332486544.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/7812443290.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/56733692622.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4863bf55---ruzetoludeduti.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/62008725900.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/17597214132.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/75582971022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=workout+tracking+sheet+pdfPDF 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_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 11036 bytes
SHA-256: 9266933e6c0801894ebffb20dddfd58f84ef0caef08cb9d71545c31c75889291
font_01_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 19308 bytes
SHA-256: e244e9ef89980c43a0ff25c71778a41b03967ea77092803da4138c2007dfa52e
font_02_sfnt_off00012e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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