Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e7781f75e697d4…

MALICIOUS

PDF

71.0 KB Created: 2021-09-13 01:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9cba67cbcfb6f89f666bb065e87d3bcc SHA-1: 1f56130f6948c427a5c3298c733ced5dd429909b SHA-256: 67e7781f75e697d4a12840f03b709f5f8938b6ce62e2c721617fbb41f5f8bc4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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.pirkitpadangas.lt/ckfinder/userfiles/files/94158098210.pdf In PDF document text
    • https://netlandschool.cl/files/49635833333.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341eab977b9---ravarevawafugotafipakimid.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/zixegun.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/leratorikaraw.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d158a1a637---29210842744.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/somaladajivofegubofo.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/31282595602.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/zaferor.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/93395361632.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/99651045659.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/055d9fd1c7fbcb6e0e3bb970bd742982/7323890308.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139aee8070a2---bamepatuj.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/16479102874.pdfIn PDF document text
    • http://www.andreapondika.cz/file/36411121934.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/34198425707.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/72293403344.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///govam.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/68382445941.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dir80scpo561ls4gci7vvqfmm7/10833666343.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/datotusakof.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/kewurogi.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/59300643233.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/20335282692.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090508465873499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=kruti+dev+010+font+download+for+android+mobilePDF 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_off0000b527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB527 10904 bytes
SHA-256: d430378146afc29c5b2298930e17345698ceeca16536c3fe90209d8251b933bd
font_01_sfnt_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 15612 bytes
SHA-256: fb928b4ce6471807e1106875ee054133068cf31d582dfb92a26436770c9fbc13
font_02_sfnt_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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