Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e080837625f0240…

MALICIOUS

PDF

90.7 KB Created: 2021-08-04 15:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ac5550514f752598f61586fa2fd6cb98 SHA-1: dc6704bd044ca7b9888de26253e6a356a1aabad3 SHA-256: 6e080837625f02402e8a46320c9c9b820f9d3202b03286636ba974fa09a5302d
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 0.9744

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb636f1258a---gejarematupikolaj.pdf In PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92c1248dc6---54772386051.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160824dd8ccbf5---toxumuve.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/boxipobezotu.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a776921945---30462133599.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/12916904474.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/fewewul.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/pubepijogobu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809aa456ef7---xufebamexufexefoja.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30847384ae---wetizavopedipozififi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcff2b5606---97895490379.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/89940744099.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/885a322917331be9c2a61fb79cec7b77/34970568387.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/928830b34f49d379c15a18fc9edbf8c4/vefivilizufegefunoren.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16072db1b81c76---vipodazujimedivol.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/0nnjoq5j07o2v2sek3kipqd8iq/gegebezome.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/73113909524.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160d20c88f2dd4---35096586772.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/riwiwepukopapi.pdfIn PDF document text
    • http://philboyd.com/vevapasokaporemakegaribop.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a541bf39abe1a93f303efec6535d1784/42752048744.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/jexelegim.pdfIn PDF document text
    • http://m2m2design.com/userfiles/sizexomisanumedogup.pdfIn PDF document text
    • https://waroproject.com/file/dilepofasazolubam.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/97727927716.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/72970287737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=head+soccer+championship+unblocked+la+ligaPDF 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
stream_005_off00011ca0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11CA0 22532 bytes
SHA-256: fd70c5381cdf7b4df86d329976aca8a22ce7eb1064762e13aec22ff954be1f98
font_00_sfnt_off0000d71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71F 17156 bytes
SHA-256: 803d197f4a617d4c887c1f0130ad02807f527c3727c0518f54af56309a4aefb0
font_01_sfnt_off0001033b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 11188 bytes
SHA-256: 2642c9e69c9acdb9f634c7c8ebd103bfa74a26416da913c70e3f1b4e6425c246
font_03_sfnt_off0001442b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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