Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac05c9f39bbe7c5…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 20:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 681f65f0d7fd2d5bc7a84bbfc89d5bd2 SHA-1: ecb4426b804e12d20ee185a70d5cd30ad9e0c968 SHA-256: bac05c9f39bbe7c51d2cedae8537f6e8188fccf4038d962e661bb55e71322f73
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm. The ML classifier strongly indicates maliciousness. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://areaengineeringsrl.eu/userfiles/files/gemomujokojikewexo.pdf In PDF document text
    • https://marikakozmetika.hu/editor_up/lakevemafukipididukozega.pdfIn PDF document text
    • http://tion.hu/upload/file/zagabutufimoke.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163078180642.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/64174501172.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16156417ca9cd8---28268337301.pdfIn PDF document text
    • http://nprofit.hk/userfiles/71830649762.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147a199a3022---89606203982.pdfIn PDF document text
    • http://hopkim.vn/upload/files/99537500550.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/80223777320.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ca005f5bc15fdbcfa313cc0f6b8841cc/meduvodamujaxovijedefugox.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/xupujenixudelug.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-9/20210909005333287819.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479858bbc7b---9294502378.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210921210816.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/fefaderoleras.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/wovenelamefimivifobefe.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/lakebalutejupuwebixipazod.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/jizimogijozuwiwedex.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/61540588d0c1c.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/91047985450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=call+of+duty+4+android+apkPDF 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_off0000ad76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD76 15184 bytes
SHA-256: fa2c9b5c8169b637e874c284d03a11bca00073542a5c4dc67029bbbbd887c482
font_01_sfnt_off0000d397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 10604 bytes
SHA-256: 8b7e217cc167ed75d5ff59554f15e76f952f087ba55fab4fd36ff5fc1f7362d9
font_02_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1