Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ff5a7b9a92b0cd…

MALICIOUS

PDF

83.6 KB Created: 2021-07-10 00:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 456be0809d1deb3eeb429baf53fe88bb SHA-1: 1e69361ae35baa13623b65c1b38db045f3e2455e SHA-256: 47ff5a7b9a92b0cdfcc719b0321bad589d0a97e072a594623e953324096ebd98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of multiple external URIs, including links to compromised CMS uploads and link farms on disposable hosting, suggests a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=habitation+meaning+in+assamese
    • http://ideatity.com/ckfinder/userfiles/files/kewemalikex.pdf
    • http://classiccar-jp.com/js/upload/files/84569453917.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/9d4f33af6c6079d61042982bba1e8acf/voliwenaxozi.pdf
    • https://alutat.com/data/file/54143798795.pdf
    • http://gemwishrs.com/ckfinder/stones/files/repadosekovodirex.pdf
    • http://tipiland.net/upload/file/faboxojewodezuto.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/i6vmtjihegqbhnvieauvtdrjl3/kafedewijanoxutekoduta.pdf
    • http://banhangcongnghe.com/upload/FCK/file/5608144618.pdf
    • http://tcsm62.org/uploads/news/file/sobadokamixorasudodupok.pdf
    • http://drivingschool-brno.eu/files/63439376382.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160847c01ee900---42169934536.pdf
    • http://pritchardreunion.com/clients/81409/File/30445806108.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ht2ancfddmiu7vmbnqefk0bmm4/roxigejowosabesus.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b967cd80852---710645987.pdf
    • https://nnkcreations.com/userfiles/file/taranikelatifapevunu.pdf
    • https://cambodiadriverservice.com/userfiles/file/kujakigalegokozuvune.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ccbc37a6---85616336088.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091dc267ba38---vukasajedinibibojage.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc597f02e---pivanusexowolodinovojewos.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a475a7ddf4ae2dee8538f561ebe3035e/bikuvexikogelugupat.pdf
    • http://sns.hu/_user/file/56852596230.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/gadozanofimuv.pdf
    • http://angarakshaksecurity.com/userfiles/file/fofopivilila.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b3fd6ade6---87635319047.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095dec16e813---5202011459.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_off0000e596.bin
7cf1fbf26137979079af0bc64f7360ecfda9fe2c4bfcff6395128d17166a6f80
pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 10436 bytes
font_01_sfnt_off0000fd3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 16792 bytes
font_02_sfnt_off0001154e.bin
814e789bb75f74ab238b1b42ee3204869081694cfdbcb9c8fb2f9cf4a3a4d35b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 16828 bytes