Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96c8b1fc0e9f139…

MALICIOUS

PDF

90.5 KB Created: 2021-07-07 05:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7be165477aa908124256809d858b59d2 SHA-1: 05a366dc6270da935905c6e18e670a90530f0bfa SHA-256: b96c8b1fc0e9f13905bc9311211668ec72fecba73889a1dc9db50ad6a2f5f503
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content or facilitate further compromise. The presence of embedded JavaScript and external links to potentially compromised sites strongly suggests an attempt to exploit users via a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af94a01bdcc---wexeb.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e212c821c6---xogez.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/da6c3a7c59b80226def68bf15205db40/4048474493.pdf
    • https://tantecoccole016.it/file/lalonu.pdf
    • https://aimhc.com/userfiles/file/15265942806.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac3df55256---54157895904.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074680522858---bawufiwovudur.pdf
    • http://musclecar-taps.com/js/upload/files/32291795674.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/7520685.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd82ec514---41834622335.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/e70635f5b02f0f3ff3230d39683e3a6a/xekugixidagojog.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad2b497869---9383486221.pdf
    • https://altonika.pro/files/fck/file/40376167001.pdf
    • https://eravukappalpalli.com/userfiles/file/gepotapukogudakofo.pdf
    • https://motodubai.com/uploaded_images/files/pedab.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/92ebf0982f463a6beb6f4dbcf649d655/6907432546.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lowokis.pdf
    • http://asbu.net/uploads/FCK_files/file/12554379666.pdf
    • http://burattinojatek.hu/userfiles/file/safokape.pdf
    • http://studiolaviano.it/userfiles/files/movutilawi.pdf
    • http://morethancars.nl/uploads/edytor/file/paremekabotesudolaveze.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609114023b280---bofegudunifo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=confined+aquifer+and+unconfined+aquifer
    • 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_off000101e4.bin
e3d76990bc2f997ff0aa9eda4a116b6266f852267f0bb6e5b567540418303811
pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 10436 bytes
font_01_sfnt_off00011977.bin
090d06574a4ca3817ee445cc05d6aeb487f9930f655a1230cf6eeab667b6e029
pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 16608 bytes
font_02_sfnt_off000144b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144B9 16792 bytes