Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e8b44adcd4b920…

MALICIOUS

PDF

95.8 KB Created: 2021-07-06 23:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e4efcee5a34600734845a27308fa3519 SHA-1: c925da0df59e6a68d01e5b637b4324067c0b7b82 SHA-256: 19e8b44adcd4b9205834b7a9566aeaaa926c2a7211b43aa8c11ee62aa32e8993
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb208de6fb4---milufurelupa.pdf In PDF document text
    • http://jarosi.hu/files/file/puvagopuxaj.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae4c73d60---lisojibipogikuroxemo.pdfIn PDF document text
    • http://novichiha.ru/pic/file/wilikuwiloxubelegepinaxa.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/7b0d31d44103b8d8f771955718c2f3e4/wijelazo.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021060500220381.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/91345295731.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/b60hupclpm7echrr9unmi6lv1u/wowonadimugufoxuru.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b9775d87684b1f584a11280ec1489580/81617906896.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608317b9eeeea---sekupusilaxekosugote.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/udib0hllk8o5o2371drvn0ji2c/37959370254.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/82262424848.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080eacb32c12---wogoxo.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bff291c46---85783567833.pdfIn PDF document text
    • https://badoza.net/userfiles/file/44710644652.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/6fbc181126d9865b31b394c7a82d8d29/80045925734.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/pidiladaronenosusisasaw.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/e002eeaf09910499359a2dfb25334a95/15705826626.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076342ca7b02---wonekefifidiserojuvowowi.pdfIn PDF document text
    • http://mesterek.net/tmp/58638420619.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2vibhc4v74tno89rfmnevfbhh0/23215523180.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/no4kb8d4ctb9llo8jqdhr4ifa6/xajomiguw.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f9a60056a---mokitoxaxulaxevate.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/9086445317.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782835a3796---3840385915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=every+child+is+special+movie+summaryPDF 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_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 17964 bytes
SHA-256: c2a3f3c06225feb7ca31a9daaee60f344afc84d907138f268ff01c9e7bb68f23
font_02_sfnt_off00012c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1C 10840 bytes
SHA-256: 0663a183f65ee4673b0925870fa5253b667806d0d6b39df649d9ba54e7cefd8a
font_03_sfnt_off0001451c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451C 17056 bytes
SHA-256: 73ee85d509b1a2e6af377c72f97753a3db1d51e38ba9a1fd83eae4632e50fbd4

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