Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb19ae74398609b0…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 02:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57f0af1b73cfab7df1b56930072d49e4 SHA-1: 2f505a7e5751a0ad0391cc358e49c5b5ecae6aa6 SHA-256: bb19ae74398609b06c07d8186088989ce29d1491ddbfce76fa1f4756c50d7426
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with multiple heuristics indicating links to potentially malicious or compromised sites. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, particularly those pointing to PDF files on compromised WordPress sites, indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://thegioidahoacuong.com/uploads/image/files/siviwi.pdf In PDF document text
    • http://bezpiecznamlodosc.org/files/file/58967146450.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/9941129401.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/sinefexutabimimisok.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/sevikiwisopagoborigika.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/sezudusalasiwuvam.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613572fda23e4---36437353321.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/tegezagirukizomediti.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1c0ad7633---xunuzezimo.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/10749576142.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/77826313559.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/leduwopasepove.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b37f14299e---vowelevoxo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161319a45c29a0---pitinetaferoxabat.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/vujamaxiz.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613695cfa766c---bikurenakoguwiv.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/24704032379.pdfIn PDF document text
    • http://lobi.md/userfiles/file/zodojezuruf.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/ferabagonuzaponanutigu.pdfIn PDF document text
    • http://klinok-saintp.ru/files/sifuvefixutiwizufoxu.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/lebujarujiwepijok.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/74079519137.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/wijipubojowixexitidito.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210909175744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=roeh+ram+expanderPDF 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_off0000c0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 17376 bytes
SHA-256: 5b560dc73a72a9e4b2465fd7d22d191f2ce8e6acb800b8812f54247ab6dd0e36
font_02_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 10400 bytes
SHA-256: 2bb888e73f2ca958ec19dd1c5b6f7ed0ce7cdee6e347849d741e9d1f31ecdf60

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