Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ba9d4e754febf4…

MALICIOUS

PDF

93.9 KB Created: 2021-06-28 14:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cfebd126e8557526233cefba8039a78 SHA-1: 7d932f1f11a5833d149f91b61196130e9e0503b7 SHA-256: 27ba9d4e754febf4767e6f1557a98c25198a6482bf7732f44ae448fc249d319e
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 CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://kuhomania.ru/ckfinder/userfiles/files/41206299860.pdf
    • https://pmms-online.com/assets/file/190976211.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d26547b84---507913489.pdf
    • http://szyuangang.com/UserFiles/file///zizalupo.pdf
    • http://luchetti.it/userfiles/files/35435218177.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/lopikepugelupowekilujabov.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6a16829b371452285d6d9c6cebc3f359/nixuliramevomolaruz.pdf
    • http://wsp.pl/userfiles/file/bibuvepitibolimutu.pdf
    • http://aaaexpressheating.com/userfiles/file/4203492336.pdf
    • https://htlexpress.com/ckfinder/userfiles/files/5368108609.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/zepemaguwurezugogi.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/c26e0a66cc7a9fce9ee151cb06cdb94b/lulojalowuxu.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/81b4891bee6614e3be01d70d508a4daf/53137482027.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/nsat5f38iumh4ct8ed1mocdlm8/23338775276.pdf
    • https://nnkcreations.com/userfiles/file/80259691662.pdf
    • http://compufoxmail.com/userfiles/file/gasutawimoxaf.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qp991pnt68fo5lf0gag5l1tqu2/2628346583.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/norumifimelutuvizi.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28fec11edf---34138266499.pdf
    • https://kildevangen.dk/files/sorekaro.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/vl5usj58buohfaas663raott90/koxeluletorirozazut.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077852c25640---wativokinoxuvugufam.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a422158b---79989981285.pdf
    • https://stdtekstil.com/upload/ckfinder/files/69713743493.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8150e38b3---toxetatepazajigikuw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=d+and+h+names+for+boy
    • 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_off00010cd2.bin
f709ba9b736764d34a3a68a60defddd33ef2ceb1777c720155d0bcb80ad11b39
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 17472 bytes
font_01_sfnt_off00013a3a.bin
bbe83f1d6b5491d931e1608a8fe3d1a9de10a3c37e369bdba483294da0f18293
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3A 10636 bytes
font_02_sfnt_off0001524f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1524F 16792 bytes