Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a01e2571124ff5f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 06:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 925bc2561cf7eeeee0d0d7e1a5c50842 SHA-1: 650684d3208965bd8834ef106bee7f6d32c3a37f SHA-256: 8a01e2571124ff5f06d90ad8cbd59f6adcef816e5e23731137148b1528114968
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://europartner2.pl/uploads/sakifagi.pdf In PDF document text
    • http://viprealestatebrokers.com/userfiles/files/91525416482.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/28862ee8a5c4d21e5c5852e9c9e54bf7/saxifewo.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/visesijerinumimibutabume.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210708_B4FE70839F2CFEB8.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/jadotoxenuzelum.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f49965e2159e7bc5b5f35d471305493/dodukivinepamoloveda.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610b510034c11---9657590832.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ci62fa24ei0s1smksj0h65ao85/2070944979.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-25/20210525204252221408.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b9f6ea12178adec0ec9c900b49312e75/wikerokemixesoxow.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/s3835plv8k8js4ethstkmrkl7m/futanebitijarokiwun.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a9716c6a713fca12e9be085a4c7e267f/bumuputidezerivuletifa.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/mubarusisaxa.pdfIn PDF document text
    • https://luminex.pl/upload/file/32944086316.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/21074924372.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/28221531938.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/jexep.pdfIn PDF document text
    • https://andana.us/files/files/81510763486.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/49693595660.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/mur39dh8dcinhvvmn55fohohn4/89951461025.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/15514391441.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5c283cc9d246963d93122c6e490f5c92/88960472453.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160797c8e96491---56947014943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=benzophenone+tetracarboxylic+dianhydridePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_01_sfnt_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 19228 bytes
SHA-256: 4809888e88439af6ce11ca58e7e03e1d09cd8385b34e411895468324ccb93f62
font_03_sfnt_off00012638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12638 10912 bytes
SHA-256: 043bd98a356052cb779a2ca8099dbf48b163c0035c5e15c5922305cd7a1198df

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