Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a12356f50eaea4…

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 14:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7179904e5dd2aa60ed1219d6475a5220 SHA-1: 55be49eb5520cd42e8b36ae2c4521eada7ebec87 SHA-256: b1a12356f50eaea4d6e22b1eb8dbafcccfc7b142058af495ca5bda461af60ae6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a malicious intent to distribute content or phish users. The ClamAV detection and ML classifier strongly suggest this PDF is malicious. The embedded URLs are likely used to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609637b79d0f7---wukimovuduzaxomasefajixef.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/97b725ffa84afd764b6b08ad600f77f4/1763994440.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9f8f6674f66fb425d92413ff1b5d4ef5/5882019029.pdf
    • http://homelife-superstars.com/image/files/marujuzolinerujarowi.pdf
    • https://aartipalette.com/userfiles/file/batovufolekodubir.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/rilobevokiv.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/s1thamiir0btt300vjt0hkf7lt/lebipebelifebumunagebej.pdf
    • https://skinrepublic.vn/webroot/img/files/zikaravapekiruxeni.pdf
    • http://albino-pitti.com/pub_img/file/sezuruvasaresikaf.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/297a49392dac210fae5bc72d7af2927a/98819987478.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/306148abca70c41db5e965aa335e7902/26903567660.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb260d919e---buwubaliwepenigijazuxajus.pdf
    • http://chinocorporatechallenge.com/clients/6216/File/jixivevuxezukat.pdf
    • http://ttlh.vn/storage/ckfinder/files/sowiwavejirekisufa.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd4811c25---21111702639.pdf
    • http://applexin.com/ttpsea/files/file/tamatovivedurusefol.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/timufadifuluxewawusedeter.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/60d4dbf676200c3f3a80d4adb922c7a5/nesoloriwelude.pdf
    • https://sportnazona.bg/f/uploads/files/jidizugonozidufado.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2132da95b0---jolibofuxifoj.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a60d5638fd5---nozimizanimonobepi.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/27483317447.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb4318eba3---7959370816.pdf
    • https://bamfieldrental.com/userfiles/file/19029165332.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=function+of+mesosome+in+bacteria
    • 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_off0000eabc.bin
23cfa87d6c59522df5a66b0d6447a80c79a429c20418d56781773f5eae0c5b1e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 10668 bytes
font_01_sfnt_off00010332.bin
9d42bfc0e46853d7c7700ee548f35169a0a55e523662647932b4a9a1c6005d61
pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 17032 bytes
font_02_sfnt_off00012fc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC4 16792 bytes