Malicious PDF — malware analysis report

Static analysis result for SHA-256 48aabbe0aef6607e…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 07:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c4df888a96162d3c86df4106ba403a9 SHA-1: 4a32033b93c92446709e1b369b9228761525cfad SHA-256: 48aabbe0aef6607e8119a7dfcced9ab2427d9160174a598b2fce47c012cb07ef
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm containing numerous URLs pointing to compromised CMS upload storage and disposable hosting. While no scripts were extracted, the presence of these links suggests the document's purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/9c02c6d0a90fc77640a9db019be04c59/78884727012.pdf In PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/144bd2db3b065b46e3bc7e73b2baf8cf/kizubobukizezujabi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160785fd23399a---repalasup.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b693886d402---98833296289.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/trkbojenqll291sbb8povsvucd/talobi.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8ec3cfedec7582a7f5ba08018687cdca/sizufiwutisomafulurimal.pdfIn PDF document text
    • http://scarpatti.com/files/moduxefegorawiworus.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/9712859461.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/sitikuvutuku.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/56610960848.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/wadanojatelizaf.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/27981558413.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072582927049---ripodetiri.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/5656066224.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/vezotejufudakid.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/porazekimizani.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097e36f74b97---kewizosedizum.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/veturukovowej.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/58680043626.pdfIn PDF document text
    • http://dd-eng.com/files/files/susawodajesokanubamamoz.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e68c9da5cad---26992540854.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/78227458884.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/e32b31b83e158873cbac0a35a983ec72/15067965479.pdfIn PDF document text
    • http://aimic.com/userfiles/file/54716208409.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/41c26133e7ad60808cfd68917ae06d1b/2250161016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=indices+and+standard+form+questions+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_off0000bdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEF 16292 bytes
SHA-256: a83a8e58eeb3f38ff0ab586bfa1b6a710d343c60cfa664cc5140c3228f8f049a
font_01_sfnt_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 10932 bytes
SHA-256: b95d3f5adf4b8827341f84cdd4e008200a6505521675afe3e6d89c2b96adeec0
font_02_sfnt_off0001013a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1