Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf37d24e0bdbc50…

MALICIOUS

PDF

94.0 KB Created: 2021-05-10 09:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2c41eb7b13f7651a75cc17a7b3611f0 SHA-1: 815e272841041adc6409ea19511eef631b74c87f SHA-256: bbf37d24e0bdbc50c1498270e46436ca8a8b144031f80146b04b622d49706cdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content disguised as application forms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071c90d16e94---wobukuvixoxakazidima.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6ec2652f0---26200507045.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/bb8f463bc1642d95b4a334fc94d0fe12/kakonigemu.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34fa156be---52206809614.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160723ac8b1912---5694969275.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01fb3039a---81023919413.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160889534d33c7---vojegitidamubi.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b741b07e---jonotawovaniz.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609495edcdc81---gavemiboditokibejefifo.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a97cf1b2---55718916608.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c786e48df5---tuxigej.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e447f6d314---rosowuweromex.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7b8881c78d86c8ab38c6ee41c2e5d3a3/42145380157.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/cef223cb39fa85a2f46b4976996e9d42/verefawuwosaxegotivi.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/da2b13a5d4eefb457e7148d667e96152/51623202585.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/001191aba27ce8f6d0cb305d3429c4fe/febasolatiretunojefuji.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c087ed6fcd8a64865f85cb6094e5f5a2/zetunujejinubupifix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bicol+university+application+form+2020
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012305.bin
4311be8fdfa6f4ab6c1ac41fc53a096a19475912b01bd37b27f3215cff559f1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 3212 bytes
font_01_sfnt_off00012e86.bin
311950c25766b364cdb6973d425d25699e2b53e9f00f152803e347b012d8a1df
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E86 5648 bytes
font_02_sfnt_off000141b6.bin
1238a92532f00d41b77b6633ba9e6f89cf158475b0f5ba9d629454fa99a61113
pdf-font-stream PDF embedded font (sfnt) at offset 0x141B6 11624 bytes