Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39d9f2ab147f45a…

MALICIOUS

PDF

259.1 KB Created: 2021-07-08 05:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3449fbd21d380be108f77b39c957d5ef SHA-1: be134ab55121d4399efde62282c8bcac0335a18a SHA-256: c39d9f2ab147f45ade3f9a13682a9d6fb2fb1023b5b15876888c2b30a1bc868d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, including one pointing to a compromised WordPress upload directory. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates an image lure linking to an SEO redirector for free-download phishing. The embedded JavaScript likely facilitates the download or execution of a malicious payload, contributing to the overall phishing and potential malware delivery objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8168

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=fancy+text+and+symbols PDF link annotation
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/lukopuferobopamipesun.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/64449995698.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/fizixotijusizob.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf1d09ee1d---50634358888.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609414b224a26---95698915118.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6a7dfed12fea3399396833fc61ecfd70/nuwesijer.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/73124024166.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/tibolawepivetameju.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f8858edd16428f8bf20a08335de8fc92/dunapekefalabezuso.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/vedodusiw.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ddc82c4b5---sijipovapaxaledegunumu.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/m0mhl5hrb4hi4v57s6o7751ak1/vibuvov.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/o5f3pn6gm8tqimfgasliiqrajc/4806421753.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/xovesidizozuzukoteden.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/fereb.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/5930061589.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/vodiperovuvajamubo.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/76442757101.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/riremubaf.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160cc39c036a86---mipajiwuwidulafidanevego.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/450688cd495ef1b8b1c3cac8d7523a86/pepaxemet.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b620d2d2a6e---kasituku.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/wezaf.pdfIn PDF document text
    • 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015669.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15669 111184 bytes
SHA-256: 3002ef5ee14e7ba8465e3e4478df39cb57155c40e781cc11b459a414d1624790
font_00_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 1284 bytes
SHA-256: 3f2eb68e56e0cc9b24f861ad510cb196f24dbc520975aefba06cb0b93c7ac786
font_01_sfnt_off0001305c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305C 16356 bytes
SHA-256: 0961662cb04092c2a645c9eeea72228496ff9c846703fb4d4e7a50cfe40555a3
font_03_sfnt_off0002560b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2560B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00026e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26E22 10672 bytes
SHA-256: 123199eaca704eba7f02bda3f45caaa460efe767e3757da43e0e80786b02eb85
font_05_sfnt_off000286a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x286A4 133596 bytes
SHA-256: 89baecd422364225c3a1d9b6aa5eedeacd1b7350e14200d836a352a7c3621f5f
font_06_sfnt_off0003aaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AAA7 32604 bytes
SHA-256: 8780e6ff5c73cb1d6365b883e81370d408d6010ea59dbce2816f4f57b95e6488

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