Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73dbf9f39990068…

MALICIOUS

PDF

91.6 KB Created: 2021-07-04 23:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d2c0b85c7b161e5fc6f97bc1a48291d8 SHA-1: cc918bab24d51ca48bd32f6b4a7e03ce325de3d9 SHA-256: e73dbf9f399900683c963a76f571f9db7ad0484d2b488900bc57ddb8104b1f63
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is designed as a link farm to distribute malicious content or phish users. No scripts were extracted, but the extensive use of external links points to a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=absolute+dating+carbon+14 PDF link annotation
    • http://pospatrans.cz/UserFiles/File/risovazosinaw.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091531972d6a---watujex.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc6dcf3dda---29356567393.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/adaa6et9intd6tluhucg3sufeo/vasekimujikoloja.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/gexakajejevobebepok.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60457274b---jibubimilidugudejebanosop.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/82573495918.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/012142096069.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/dijetojofaw.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/siwuzunivitozatarojazuza.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffbb4b8b0f---sewepefiretosajub.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b634ecfc2---beripizipabubusib.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/20070109663.pdfIn PDF document text
    • http://feast.to/upd_file/96142970500.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/73582402623.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/4v12pe5lvk7segdsica0d410qj/68773306362.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/4243609409.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/97110221206.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/nakuzenaj.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/wemilatibubexusomodub.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/97779142447.pdfIn PDF document text
    • https://susta.vn/userfiles/file/debovukijedopoforagad.pdfIn PDF document text
    • http://93564497.com/userfiles/44693166544.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/risp96eiv05kjahee1qo9upj50/35649810758.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/xesupuf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_01_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 10896 bytes
SHA-256: 8a135c5f4a19337b129050d5b56b4ca3dfcbdece5c9c6bc9c0d0bc06618bf491
font_02_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13384 16884 bytes
SHA-256: f2ebffd1d9a4e4cd0c0fd011faa825b0b3a9ede37e227cecb5b72aaa551d1885

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