Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c0b3a489ee844e…

MALICIOUS

PDF

85.5 KB Created: 2021-07-10 03:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5af08fd4c673162c2bb318bdcf1cb19e SHA-1: fc4f031c7eda17643aa3166c476b23e45565fc32 SHA-256: 46c0b3a489ee844e0d8846d96d53ed138a0d6e980fb3f6df4dd0eb63845e8119
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The PDF structure and the presence of external URI heuristics suggest an attempt to lure users to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/pdock82ratsugnn49d4kbob8d5/83630007054.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160defcf2b52fe---zegewolakixaji.pdf
    • http://www.hydro-tg.pro/upload/file/dumevivoniwiba.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609de14eec87d---94051161921.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607da298a29d4---tabomojowiregazijobesa.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d00a770fbcdbf633c9aa8e261c7acbb8/58973596540.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eefcd14976---kexupesejakasotakawa.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0b9754dd7---81527887943.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9709d56906e0baec574b2dfc9247b5fe/80021675584.pdf
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/34769048514.pdf
    • http://alibabashipping.com/userfiles/file/sejewazavanumuboge.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/052488bd40c122b58ae0b952a27cda85/6070278938.pdf
    • https://rijst.nu/userfiles/file/dabujunekarawofufurud.pdf
    • https://dpt-mh.com/uploads/news/files/vikixunifakabobusup.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f748ef3a---fozulolijanemokub.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b05265aa124---23311036830.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77797c943---79035747340.pdf
    • http://alltechsro.cz/files/78200509575.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076939855633---befumegasivazemunozit.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/4005817869751add96dd4493c27dc1f9/pakikanenubijudeb.pdf
    • http://pelesiuvalymas.lt/i/File/mofosogijinafiloleje.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/78c84881e690b8a3f386816532ff437f/zedatu.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/83bf5a53bc4605c13b132f0f7c3c6e0a/jomokuwi.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2uc724dbdi20220kk1fd03bco/10818666708.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1cee49613b---66988613877.pdf
    • http://asja-doll.ru/userfiles/file/nonadafezitopubilirox.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc36bebfccb---zudele.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+mix+brick+red+acrylic+paint
    • 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_off0000ea39.bin
43939f2280860a12f73fab96f5d1f6b7630ebb8568c9d070cda59af0b872e35c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 11032 bytes
font_01_sfnt_off000103ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 16792 bytes
font_02_sfnt_off00011bbd.bin
79bec5256c366fc031451c6d1e0211874bfe9dcbd2e53be5e8e5e72274048f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 17136 bytes

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