Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca1dfb0af250ef6…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 00:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f6602a5d692abf26a5372f451a7d8c09 SHA-1: 9aac5c7d57ad1b4de57fb57d30d616942a6a5763 SHA-256: 4ca1dfb0af250ef649820d9b60303094f63d1d6aa4774db82dd0885717573a02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. The file's structure and the presence of external links indicate it's likely part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://chcial.ru/uplcv?utm_term=download+cit+bus+simulator+indonesia PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hqdgmfsva1o0puom1gc5rltn81/wewofajob.pdfIn PDF document text
    • http://eva.am/files/8978a200bf9683bf.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/burubefuv.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/956e9229d7bafb78859c93717612426b/43042096457.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/76667989471.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/88898219516.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/lamibabep.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mulilaxarubo.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/vabuseke.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c7bc4126fb86b07ae786e96b2a8a87f3/33323760147.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613410de2646c---12491617706.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a95fc48fa1---liwotijudepanepajazabi.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/13278216848.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614931f031e86---kumebakesefipopedevagob.pdfIn PDF document text
    • https://sanidom.pl/img/file/kemulusekovusupate.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7939449c479ef731efab8ea561d61a0e/sakezamupevugugumirig.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/kijuwo.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/mobawukofukowavureluwiza.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/xonumijubaxulinekibe.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/2076264776.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/vomozu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/neloxaxiz.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/37152472569.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e05be3811---29161246768.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/64550414268.pdfIn PDF document text
    • http://someteme.com/archivos/_20210911040623.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DF 15888 bytes
SHA-256: 51beba6bb35ce4a1fc429f4763ca7e99bb0152cc80afb1636a3291e634ea6daf
font_01_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 10860 bytes
SHA-256: 749c067a63f59b2e7c6b110d940cfbf121ca0d9ac1125757582f1bfe02dc0821
font_02_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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