Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a19088aff3146f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 09:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 31c289bf579a2919f0cdbd087bb62bee SHA-1: ea76232d0dcb3fe00c27f6062bee857b350d09c8 SHA-256: 11a19088aff3146ff6a6cfb9680835784ccd5b7b02e94107089fcac521b6a8bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614232891c126---36203492207.pdf In PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/38084421019.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409b0204631---27438476547.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/dokavoj.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/lunexarexelor.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/veponepik.pdfIn PDF document text
    • http://bscartridge.com/pic/zumejirewivuzoma.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/19494167706133d2b534b91.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/pivuki.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/wusiwuwul.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/najimaje.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/widejiponox.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090302321976.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210908080648_4yf7nx.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/pesuwepepogoj.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/wesegelikemetagibixadowix.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/tuwad.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416d1c4d0c3---nugibevoko.pdfIn PDF document text
    • http://jainfarms.com/uploads/49521524134.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/lixepu.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/77888194095.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/rorovadaferejovuwej.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/17737717193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=my+hero+academia+season+1+episode+2+full+episodePDF 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_off0000d0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C7 11164 bytes
SHA-256: 201e9e1ce7efe49a56900f6afdd10473d3e85d1754005831bf6675c79ec3063d
font_01_sfnt_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 22400 bytes
SHA-256: f2d47a321428f1bf589e7659316ca4e4549b75f63e94e6100cf7883658007f78
font_02_sfnt_off00012533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1