Malicious PDF — malware analysis report

Static analysis result for SHA-256 846ce0d08103232a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 13:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fef6b2eb4835b11948fe62526a4fcb59 SHA-1: e27fe77a0ea5110294d6b2648e96af1d410f3408 SHA-256: 846ce0d08103232a4f71231e7504b67b7c824bbdbf8e257cb3743040a3aa62c5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and detections.

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://karapinarinsaat.net/userfiles/upload/file/wunazarukitoxosa.pdf In PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/20954624690.pdfIn PDF document text
    • https://renetravel.ro/images/files/bagux.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/92408625717.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/wuxolu.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/2622927733.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/lifejisuzoledo.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/64915820852.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/34297408064.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/85492199686.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-13/20210913223846542841.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/xagefirominidi.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/nitiluwifumaluf.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136afcfee4ff---fegoxebinagekax.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161381cf4019fa---xulakafubabuwewa.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/fijegoleza.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/vakaguvamuposijefuzesitun.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130056fc7a02---lojosuv.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/zuvuwagunuruvofaxenix.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/65989cdb6a34f22868b2ef3efe2261db/84660991467.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/60867306426.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/13787262706.pdfIn PDF document text
    • http://onlinevay.com/upload/files/dobipamu.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/4915668741.pdfIn PDF document text
    • https://ibericadearmerias.com/file/tixofofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=naruto+storm+1+androidPDF 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_off0000c0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A6 10360 bytes
SHA-256: 4a1d5255b250592212c5400102c80e8b7f4d44d93ed12beb3c84da0fae5d0d77
font_01_sfnt_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 16656 bytes
SHA-256: d168fd0fbcfe3999d191cdb90d92b2956bf2ddcf622585624deb3b543d8dd28e
font_02_sfnt_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1