Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81f1a2df82d6c28…

MALICIOUS

PDF

89.4 KB Created: 2021-07-05 02:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b90cf80d1612ac963b168f4fa18d28fe SHA-1: de7dde2a640cd6ef011e2d97d39a1c6f5d99258d SHA-256: e81f1a2df82d6c28a6740b1a2e2136b419cbcc62a0ee41f17fa40367de07a824
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of multiple suspicious links strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c74d1f929---tededoxowusigarir.pdf
    • http://mediaworld.pro/ckfinder/userfiles/files/ripebuvom.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/fsbq2c8kobmgk8vp18j6lkd3v3/54789741327.pdf
    • http://rajskiewakacje.pl/userfiles/file/gotokuzomujebewufode.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e900d4b62---55385985853.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b5c0964d---23804362926.pdf
    • http://annandale1963.com/clients/69704/File/89938924268.pdf
    • http://struttur-arch.it/userfiles/files/75312719679.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b72a20d336---silirifo.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5789fe412dc8153aa00e5fe47ed41e0f/73240733063.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/jbrqsloqvm0r0v35i68kp9ictt/didatesefuluzo.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/96526342105.pdf
    • http://asesorgubernamental.com/images/file/pefasekigen.pdf
    • http://tycoonmedical.com/userfiles/file/zefasu.pdf
    • http://luatsubienhoa.com/upload/ck/files/35109576321.pdf
    • http://megaprestige.ru/uploads/files/12422358878.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/d9c44f3c4d5f4e0f19bbbd00c68a5420/darivunugomitufibiroj.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/1d5d2d08bd11f2d461021ef503d6bbf7/84086163325.pdf
    • http://greenbrier101.com/userimages/41025821592.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/deda57f9435072360d15c7f50cfe1f3d/81313082897.pdf
    • http://rotang.net/userfiles/file/lusedufulijef.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73cf03492a---34139323476.pdf
    • http://aircond.md/upload_fck/file/ponuxipijenifabotalemujo.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/h90ob9u3a9d729cgq8e7s1430g/zukapivezide.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/56e98efb376a339202b994b9e07fe9ac/28913514069.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/orfdq1p640nj8u1gkuua8326f3/57742794492.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e3ef9b0f5---57189610473.pdf
    • http://asiavent.com/UserFiles/file///73799802661.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cher+greatest+songs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa47.bin
90fd446e1f3e7be481e37cdd20e0bc373588ccec95e311adc0f0d1bcf30eef44
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 10280 bytes
font_01_sfnt_off0001116e.bin
8cf726e6ac40f716b9a1d040d28347318feb2b01862cdc522a5a056bc9251235
pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 17756 bytes
font_02_sfnt_off00014017.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14017 16792 bytes