Malicious PDF — malware analysis report

Static analysis result for SHA-256 437f938463510c33…

MALICIOUS

PDF

91.0 KB Created: 2021-08-05 00:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9eb0636739c5354c270db1ac2440b15 SHA-1: 3e1c14147e88a388666d881ade01b6e20726d80b SHA-256: 437f938463510c338305a71a29277d5b1964d5c0c03d86e20d5a834237c19472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=canine+teeth+age+chart
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b45aa8874e---56183284337.pdf
    • https://immobilgold.com/file/67457415923.pdf
    • https://dineflon.com//files/60331229530.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/kebirepuzenimam.pdf
    • http://tks-forever.com/upload/2021/06/21/file/63045516275.pdf
    • http://yoron.net/up/files/46264025249.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e8f061ce04b3ba3aaed39e6780c728d7/fupewebufipapova.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/cf2d2c035f6c8371485d7e6abb06f6e1/xukipuvegavuwuko.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/tq59d64gvb00q5l2ld3j8089qh/kasusuw.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072577cd2cf6---1151959633.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c96fb271fe014520cd427b1f9d080a5/10493496672.pdf
    • http://stylekd.ru/files/54164666464.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c784bcda74---dematovew.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608569c8d8bf2---86882043046.pdf
    • https://asmitahrgroup.com/ckfinder/userfiles/files/suzivavojulotiwafofipe.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ssmgv760231oe02nsov768ntmp/49919389770.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b37e9605b4---vabikawu.pdf
    • http://ttlh.vn/storage/ckfinder/files/85253738644.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/rexirejibitop.pdf
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/48554687610.pdf
    • http://areawifi.com/DESARROLLO/userfiles/files/genuzorokamizebek.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/68007352940.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2c3684b477f9f072d0b0af3a5598a670/tigasigisorazaje.pdf
    • http://ekorob.pl/userfiles/file/38605132157.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_off00010174.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 16792 bytes
font_01_sfnt_off00011986.bin
ce12ac83247db45e14dc948c5e70964bd59d917c74d1dc02280d04b71afb7170
pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 17700 bytes
font_02_sfnt_off000146fe.bin
ccf1c2b3ac00577c8496792e12f39b384389eb3be26cec3e6d9fbe77ec9081ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x146FE 10208 bytes