Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb7924f45e6fa12…

MALICIOUS

PDF

95.5 KB Created: 2021-07-30 07:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5989a69a58a75f23b613be221d3eb3a SHA-1: 869f97d7f8f44bf5d8eae381043460b95b77b923 SHA-256: ccb7924f45e6fa1228cdec0163c60d3b4a1f2ba8270867120d917b12d8d3a9fb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://vantaidongsaigon.com/uploads/files/kumibejamujoro.pdf In PDF document text
    • http://ashioke.com/images/library/File/14544029306.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160792d3ab40fc---fenotatuxu.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/62111237360.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/kamivitativibixup.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/1180984605.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14d4b16ead---jotebeluvikakeki.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/zufonof.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021071306081643.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/grbnik8o6ftkhacte15kf98472/55335984192.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160859421ca99b---gobezakel.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9ee6325a---50727766474.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/baligarubexenubuwukapi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac6281dbae1---45418660622.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/21164251356.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/kakosezakowalokazal.pdfIn PDF document text
    • https://msvadba.ru/files/file/37970099031.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/35283418786.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ef795a6d---15070102685.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/81869752384.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0f88b1a8---gudogomova.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607793f0011de---kekanixadosepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+dauphinoise+potatoes+videoPDF 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_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 18464 bytes
SHA-256: 16e91c90dd089e8f2db54e565439562cdecf6718da9c3766e759f6cc5671bb4c
font_01_sfnt_off00012879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 10848 bytes
SHA-256: 344ee313e9eb4e4c5b7c08fdbf6ae29b08fd0ebe13ec09c30da501438adbaad9
font_02_sfnt_off0001415a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001596b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596B 16340 bytes
SHA-256: 88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15

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