Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd60ed11c075c638…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 19:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72b2726477cf215762ab148e16793f27 SHA-1: d4ef26daa2a98165639faab8b6f2e0aa52b42787 SHA-256: bd60ed11c075c638c6fb46a2be23676ab61d82e82240482b7ce2c980dd51e6cc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.allatpatikapecs.hu/images/file/zorotelinux.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/16485436334.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca00b9e11---50699056920.pdf
    • http://sun-eko.eu/files/file/sopugo.pdf
    • http://cmepta.com/clients/7/74/74ea2f63c40943e6497cbf70acaf7c81/File/nikilafetikawofafa.pdf
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/72400458594.pdf
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/61800988770.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607f88b582f5c---86297875778.pdf
    • https://fceresources.com/ckfinder/userfiles/files/1660669742.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/1e7eb8f9422ea4dda9b29303f64fbb5b/lejibekaj.pdf
    • https://derechosenred.org/aym_image/files/mutovobunesajisuxulevin.pdf
    • http://istvietnam.com/rich_editor/file/tupipizigugumaminilakuxu.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/4f056dea45b0fc53272720a9b8eff3b8/bofoladug.pdf
    • https://jagominum.com/contents//files/loxijanoda.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c12fdda6a01---40354694675.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/682bff420cca3ddbeb0ac2a667bd5241/9507393151.pdf
    • http://iscyber.com/userfiles/files/dokipi.pdf
    • https://conexusinternational.com/ckfinder/userfiles/file/maminoxamixonodimubizufit.pdf
    • http://longvu.vn/Images_upload/files/vigozalisakoruj.pdf
    • http://3dprofi.net/images/uploads/file/nekegew.pdf
    • http://gramercygrand.ru/files/file/kurosisideras.pdf
    • http://jinyezi.cn/upload/94963049757.pdf
    • http://alltechsro.cz/files/89372044613.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/66cd433ca2bccb4991cde4a6d2d476aa/79976395149.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=properties+of+state+transition+matrix+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d112.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 16792 bytes
font_01_sfnt_off0000e924.bin
6d20ff2c9cfc257e162aaf3b65cae908f17d5a882d4e6ccb972d82da80ea93a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 17072 bytes
font_02_sfnt_off0001153b.bin
e33ef26a2d7060c60b1c768e58b4641544114af4ab7add1ad72714e26bddbda8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1153B 10716 bytes