Malicious PDF — malware analysis report

Static analysis result for SHA-256 774b7e81d1a90fef…

MALICIOUS

PDF

88.2 KB Created: 2021-06-27 15:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61518b09551f2288912db28709044d34 SHA-1: 5b389a19c4a87b0047a4de46cc9f8c74d9839be0 SHA-256: 774b7e81d1a90fefc2c5f03f3c97a554bc27c2fc41658a6ba205360de5320f27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of links on compromised CMS upload storage suggests an attempt to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://ash-graphy.com/userfiles/file/moweputumufujaki.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912a790212f---94866898841.pdfIn PDF document text
    • http://fotossc.pl/_files/file/72522470906.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f2d7d8e1---nemowogufazefizidevibigev.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/33413754229.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/ruwerowutubumisusolega.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769986a27e5---41028140281.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/12368224646.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210608_F2BD33E65FE4981D.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/kexevuzikowomerijofe.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/suxujojezupivomozi.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/punovonixuwase.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/siwujepuziw.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210621185734.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d3f220e0c---6883720417.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/6i67nkj1ncr2ql453cjnoncr78/58954111070.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/f65fa82eedcb3ad31cf5d9a057ae591c/6737517966.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7d1a6362f---33330179209.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/47025846917.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a5298d6364c---38308771130.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/wufejasofazekekutosako.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/866a5a9634380be8603882a7f762e32e/vixiditekufexu.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/54541603471.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160987c5c8621c---waroj.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7386d1868c---vegokegolewuxi.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/85195570003.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ik6vo83e3v4u6qa3gkdn7qpau3/65775958569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=aiden+from+eastendersPDF 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_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 17956 bytes
SHA-256: 45a0127e8ac3bd4dd1ebdd0b19b15db0b6e70abf58557b4554ee690629fd5d72
font_01_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 10452 bytes
SHA-256: bddf87a5b61e329ff476f2a9d68450e3234e5d7420c4e24b76375cbda4792c9d
font_02_sfnt_off000139c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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