Malicious PDF — malware analysis report

Static analysis result for SHA-256 60ad236a1ae6178a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 11:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4231e268ebad2f42a2363e3fe6ba4d82 SHA-1: 7f8366abc77e1d8222fb114367bdbe4d84762a28 SHA-256: 60ad236a1ae6178a20f876216a7c871c78dbeb6fbf92e24c09d442fdf2584162
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://barrier.exma.cl/ckfinder/userfiles/files/keguriwila.pdf
    • https://loyallcanada.ca/editor_files/file/zoladobidixaku.pdf
    • https://gogift-it.com/userfiles/files/pukipoxokerebuwis.pdf
    • http://fujavietnam.com/images/Download/52751649802.pdf
    • http://sbstroy53.ru/img/files/29131925556.pdf
    • http://ciaomamma.hu/editor_up/86061098289.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce1b48ae90---jivokabaxun.pdf
    • http://faceconnects.com/ci/userfiles/files/jasifefijonozowegen.pdf
    • http://bckbytow.naszbip.pl/img/upload/files/15284265492.pdf
    • https://ladangmimpi.com/contents/files/sabowi.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/gifepulet.pdf
    • https://strefaokazji.pl/uploaded/file/29907932987.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/vcbf6mrcrn1jmrtslr1skmf065/63298454570.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f15e6aa5bcc5c8843f798cceae5754a0/90024533104.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/7953054415.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d104534b2ecfd30e32e2af2bccbb4c26/tekitalomufuwa.pdf
    • http://madang.eu/f_pds/fck/file/44436042192.pdf
    • http://dambi.pl/userfiles/file/2596750665.pdf
    • https://sogelec-eng.com/files/ckfinder/files/98397178735.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e436724442---duvomobewemule.pdf
    • http://kangmeideyiliao.com/uploadfile/file///2021090111184544.pdf
    • http://sisparts.pl/zdjecia/fck/file/82960077696.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/tunajetara.pdf
    • https://dakhoathienhoa.net/images/files/88431676592.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+calls+from+pc+using+android+phone
    • 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_off0000ee66.bin
3d73bf419a97350d7e8d89e487bb29f02bf668239458339019fb55e439fc6c54
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 17164 bytes
font_01_sfnt_off00011ac2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 16792 bytes
font_02_sfnt_off000132d9.bin
f8f86af5e8047c11b2b55e5ab893c568f5bd58a0a581e1671d618174b9ea38f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132D9 11336 bytes