Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad5827f7249a848…

MALICIOUS

PDF

85.5 KB Created: 2021-09-02 15:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c7835f520f45ee45c1a15b158a4d3d8 SHA-1: 1a86e8cf29cfb7e3576f7000eb942294f43cb181 SHA-256: aad5827f7249a8485a2d04f91737359ddfc601fac23f15a9f478a80d6a87e346
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Numerous heuristics indicate it functions as a link farm, with many embedded URIs pointing to potentially compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links. The primary attack pattern involves directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://anthonyvienna.com/sites/default/files/file/90698773551.pdf In PDF document text
    • http://soft-pro.hr/upload/datoteke/kalelar.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/kolazizulofatuvunopevusa.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/76565430953.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091055672dc7---vetapovisofarin.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/98729944602.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16093399737c74---siwiv.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/gawobobe.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae571399c---kariwatuzelowusaweba.pdfPDF link annotation
    • http://seksdagen.nl/userfiles/file/molagetegurel.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/66617870668.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/07a0e4cdc21ab0cbca42ebf85d110b7a/87171154949.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d5784efdbe256b9deacb38bb7f82dd83/49831814691.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/logujizewowegufijifa.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ab4366d0---labevifefefapexafudidufiw.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/sazorew.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/cf03b52bd9139651d1ee45f6fe1ffbac/76480508225.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/d211cec55096c24b555470a479c4f399/bupoxipizedamibebev.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/91074474230.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5b5307cf8---nepuz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/00m5gslanqsv4lug1eqgrn6g33/dipajukuzedodaxesopuzig.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b79009a68eb---18943077171.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0vai6psm3hmvhs6kc0hltr8a21/10254860302.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/rcamo198c6uas9d9l5njusio06/womerijuwaxaluvu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1b885d3c3c455f3fa6474d55300ab6e2/76462922000.pdfIn PDF document text
    • http://foodchemsino.com/d/files/40968181577.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/fesaviritebejodakajozunox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=simplification+problems+for+sbi+clerk+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 11088 bytes
SHA-256: 99cad67565710d54925496f11a608ad167780963551e03f4fcb7a8df91b48ed7
font_01_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 17480 bytes
SHA-256: 008c72418cd3141de6aefa9182ec4802c4132ee79d97f921b44f403f8055da02
font_02_sfnt_off00012f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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