Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bd8b02439ae286…

MALICIOUS

PDF

76.1 KB Created: 2021-09-20 19:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d14dc8a676753f1a9b601bc8fbfd362 SHA-1: 122cd38c4b1e89ad43bf06323fdb40df608e2329 SHA-256: 20bd8b02439ae286c73980884db64be6204d640a1a65b19decc952f347a34d9f
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 or disposable hosting. The heuristics indicate a link farm designed to redirect users, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cattaneoarchitetti.it/userfiles/files/kevudelokelimukon.pdf
    • https://ghnservizi.com/file/16688562920.pdf
    • http://marinda.ru/pics/images/file/87112082790.pdf
    • http://zaintik.org/files/galeria/files/zefisaruziwigu.pdf
    • http://jongauger.com/userfiles/file/14965967421.pdf
    • http://dobre-jaja.com/Upload/file/61591681965.pdf
    • https://tramhuonghanoi.vn/upload/files/roneriwifulisikafuvubibi.pdf
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/77755327359.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb86f556ba---nopozasosavadejapug.pdf
    • http://biogenetec.tw/image/files/20210917_115341.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/78371363291.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/derolopexidokopelijoxitiw.pdf
    • http://rileyillustration.com/images/agency/files/99718964111.pdf
    • http://budka39.ru/files/71738919869.pdf
    • http://yanartekstil.com/firma/files/rofitapajigipazujuw.pdf
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/netaxuperelofuxofifi.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483c92c8c50---wuzadu.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148b19d8c6da---58931980562.pdf
    • https://pui-vital.ro/msg_media/file/dikewosasuburire.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/73084604936.pdf
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/muwezulaxulavitowirokuvud.pdf
    • http://wawa757.com/uploads/files/79772982781.pdf
    • http://mama-care.com/UserFiles/file/95861641212.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=top+10+android+emulator+for+windows+7
    • 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_off0000c383.bin
8a0604d51eca774711c35a528f98a846ac70cfb80e600019e7a3dd16b34bac37
pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 17216 bytes
font_01_sfnt_off0000f07c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 16792 bytes
font_02_sfnt_off00010893.bin
45a41986dcfdb011b2b9ef7bc0217727b53aa4a82cd73c223665749a6e4d7656
pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 11032 bytes