Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5d8e15fcb1b812…

MALICIOUS

PDF

90.5 KB Created: 2021-07-09 13:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 952ca37637ecb5d0d37d38f1ace75037 SHA-1: 34d6c123f27e4d6825a28fb2b39a9324be79469d SHA-256: 4a5d8e15fcb1b812b68dd06df592dc36c5ca8d0128dfc4dee0efb7962969d47b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload directories, suggesting it's designed to lure users to download further malicious content. The presence of numerous unknown URLs reinforces the nature of this file as a distribution point for other malicious artifacts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba9743f297---kagagobobowomofawuboloxuf.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/92183686530.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1939125ed914f7682bfaf2201d63c2e4/gegumugogiboxolivegotike.pdf
    • http://ehs1958.org/clients/73155/File/mumagugaveridefab.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7981e5dab---54515485923.pdf
    • https://vildmarksjagt.dk/userfiles/file/51379436154.pdf
    • https://italvaping.com/file/dirux.pdf
    • http://ahkjt.com/upfile/file/vigasokukolusirodo.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/59c8ce5b0fe0dc74ee68d391a7fd265d/wepujorozotesefonuk.pdf
    • http://allaboutdowney.com/userimages/rabirerepazinomedibegoman.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/913db43d8779299d762fe7620ce4e4bb/xabelenebazegizomoriwi.pdf
    • http://jncs.kr/page_data/file/20210619020606.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67f225a32d---bowidu.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f06047ac3---fitikilisadapesow.pdf
    • http://bungefamily.com/clients/5233/File/38161050638.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/7859a610928fbf76d682c34f22b27dac/pusegumomatu.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/lifun.pdf
    • http://www.aqsclimited.com/EditorImages/file/batibolekotila.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d7fcb1e27f485b647a4841c9adf55a31/repirebonegarewatolisodev.pdf
    • http://booklandbooks.com/userfiles/file/6806406835.pdf
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/12386646069.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/070d2cfe6d85da4c408278fe40bf14e6/26878716985.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8c65e92bcc1c552ad1b9b73cc292120d/48188189494.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=indoor+jumping+place
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75d.bin
cc036127db23d644fd8c5e77812a0b07c508ce4649453d8cb37ed014aeb87dd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 17824 bytes
font_01_sfnt_off00011626.bin
bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 16232 bytes
font_02_sfnt_off00012c09.bin
5e68e3a4fbb3bc51bd3a8809ce93228c7b13d533f7aff93c97d3d504b067df80
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C09 10772 bytes
font_03_sfnt_off00014477.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14477 16792 bytes