Malicious PDF — malware analysis report

Static analysis result for SHA-256 abacff6c010009a0…

MALICIOUS

PDF

87.3 KB Created: 2021-09-17 10:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 082894e7ae3a68c620011cf63d633b35 SHA-1: b3cad681b1ef03be200077cf4beb7ac70c68f366 SHA-256: abacff6c010009a0ad6d15e73f953d5b6113e8c0032cb7a5b2008d67face41c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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
  • 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://catamma.ru/uplcv?utm_term=how+to+find+apk+files+on+android+phone PDF link annotation
    • http://doks-films.com/pcms/content/file/88752011862.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/72894816392.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/cd393fe215f179686b195b22c1770c72/96938469175.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/53185328618.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161409006238f6---95322100092.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/fuvureg.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/gexigakekepewodo.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/23783312686.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/jajekajelagoniwanuxowosar.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/lozavuponave.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/kuzazabogikuxam.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/kibofogatalerugorilubip.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/92722051321.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/10818918063.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/31303823548.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/gumibimuratunufumefoda.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/98224864110.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090712570788146.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c347eaeaf89d717a38aa816facd05f4d/paxawubela.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/65931950434.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2d54e398---21606900797.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4650ebf6f---petevizusezefonexogapubo.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/samumanesi.pdfIn PDF document text
    • https://podimercrm.com/img/files/jobinogewijojawamutix.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/99858707813.pdfIn PDF document text
    • https://naves.cz/res/file/51142450132.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/lowujapikidefoxezogesafiv.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_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 10764 bytes
SHA-256: 8850b043c19475ccdb4a26a78a989bc2d7a35d0538447beb0c9a2cdf203c0321
font_02_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 17252 bytes
SHA-256: 1242366c9e6ce06478b9977f6e9ccc718290ba66927b4674f1495f5e575fea5d

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