Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bf3d2afd9e4a49…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 16:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 575bebb7364f5842a0f712652850a981 SHA-1: 853ff9eb78f9b027aeedb23caa28f63ede93f027 SHA-256: c5bf3d2afd9e4a49ecadf9e6c29843512a43afdc85ddbbadca0b084940b3bf3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/vanovepuwe.pdf
    • https://sportsht.com/userfiles/file/tozigifu.pdf
    • https://saatyapi.com/upload/ckfinder/files/54103843492.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161408ff91fd7f---malusakimijizixu.pdf
    • http://yuli-china.ru/d/files/nijala.pdf
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/1866587655.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/afdcd4be6a19bdb0943c423135c184b7/45685952338.pdf
    • http://kristiankutschera.de/userfiles/file/mewikotumixi.pdf
    • https://lawina-radom.pl/files/file/xedasamusijajuzomujaxof.pdf
    • http://www.agenbenangbandung.net/file/buzukuj.pdf
    • http://rc-mst.com/mst/_upload/files/31015507270.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/nafik.pdf
    • http://canadapremiumlubes.com/survey/userfiles/files/73100896561.pdf
    • http://pokeocncafe.com/uploads/files/tabeporuluvepuwazude.pdf
    • http://babijie.com/upload_fck/file/2021-9-14/20210914054259486031.pdf
    • http://urgentcarepb.net/userfiles/file/43050894097.pdf
    • https://pearproperties.in/userfiles/file/1994154408.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140871c52f43---bokegisamunugereputez.pdf
    • http://slovoveri.org/userfiles/609238291.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/dunumivi.pdf
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/tamukuf.pdf
    • http://festacreativita.org/userfiles/file/58915790072.pdf
    • https://aspit.ro/imagini_ws/27906719353.pdf
    • http://theaterbuehne-schwandorf.de/userfiles/file/54119383098.pdf
    • http://sooclose.eu/upload/File/letisujimufixosor.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ai86ufsjceid9p9ishh1lnhcsc/gixozaletipedorisumemopib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mirror+phone+pc
    • 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_off0000dc8e.bin
72660a26d07959ba1ac77da02f460aabfcc3e1362e7ab3171c838949dce4ad4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 9988 bytes
font_01_sfnt_off0000f28d.bin
fec8cda484bd749a2730bc653ee433bafa3cbb2b775bd1a75194c95e75c0c13b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 17768 bytes
font_02_sfnt_off0001205e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 16792 bytes