Malicious PDF — malware analysis report

Static analysis result for SHA-256 0465b80b7c0c2851…

MALICIOUS

PDF

126.3 KB Created: 2021-07-12 23:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6c73a0690bd2e222e36448d8be6ad422 SHA-1: b2ca4fe35ea8e788b14caaad5729678970a05325 SHA-256: 0465b80b7c0c2851609880a2c0beb9a27d02049847bbe0b730a4c39b5c3f61a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ad3kp8tjcm8qv8671e2anahgfg/86831481632.pdf In PDF document text
    • http://orsini-blasioli.it/userfiles/files/geresufujeru.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/2628020801.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc6d04d9cf---jevafij.pdfIn PDF document text
    • http://calisnt.com/uploads/files/46577632630.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db9dc9d1c5d---19867031998.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/mejakejul.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/bagaduxijanepovuxideroz.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/95697523049.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160798b5be3400---zubovevutumuzufika.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/97746940103.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2kn4h1ddubmp6d1i9jb381cak0/fujuba.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/bejasipiwuba.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd1468ad89---97758065622.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/83511081019.pdfIn PDF document text
    • http://jucal.es/images/file/89706803208.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3182eff09---xosifi.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073014ce613c---79695807197.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608344b9c982f---4320304369.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b462737c2da---38984330200.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/38365780502.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c98a5f834---16610539808.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/29510836336.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/bupenefinolanepixit.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/88786511220.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/9676502514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=definition+of+early+childhood+development+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000188a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188A7 18236 bytes
SHA-256: 1cd7dc3e30a9679c56033ffb1f6de262e1d1a2a79379b1a55927b5d862ed5308
font_01_sfnt_off0001b831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B831 10896 bytes
SHA-256: 5c2fae92611db1c09bee9835fc4767c191478dac3d57c109b84e5813e0989cf8
font_02_sfnt_off0001d140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1