Malicious PDF — malware analysis report

Static analysis result for SHA-256 1adddb8f66546910…

MALICIOUS

PDF

77.8 KB Created: 2021-06-28 22:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 340bf3ee523c5fb2e082858f9b90772a SHA-1: d802c48cd026155e25180ce3a4806bf16e6caad1 SHA-256: 1adddb8f66546910ae7944c0609010f7c0c05f4a7417d35426f608111e27bf1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/dghu31i46eta155lra2a37m05m/3744187663.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb293ccee9---poxafasuwe.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/40785956888.pdf
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/jekaretikevaruperu.pdf
    • http://hodori247.com/uploads/files/xegilisum.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090664ca2986---5689089735.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/30826853938.pdf
    • http://pspectr.ru/userfiles/file/dedekitonolulibopob.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ooqbb5ohneh4qhv1vh6clcbmjk/xibumizilawidulo.pdf
    • https://emotionalgift.com/ckfinder/userfiles/files/benufoputatulij.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607351c1cb3d8---15999013459.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/n2i08sim1bm0hpo80n3gjlmj6p/70144618701.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6c464edf9---popobijinepofova.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b014cfc9---refisalufidajozuvanekad.pdf
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/zadamof.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b603619c22d---jejunojokinosetezoxoji.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d3d5bbeea05b7dbb449bc4b7c9602fb1/2858358780.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5er1e8nvln8mpbe24eq75rb5km/kejavuvolike.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d53973686e---96719538251.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c8baddb06df2ef558a0da1dc6d1d52b4/61688186441.pdf
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/saxijujuxupisudutegokad.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f0f25bfe081f58b15e397372fe4d3b4f/62312589880.pdf
    • http://andrelandberg.com/userfiles/file/saroxuruwudewit.pdf
    • http://eotp.info/sites/default/files/fck/file/26608057539.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081817dbc01b---45086239520.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=verb+to+be+exercises+worksheets
    • 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_off0000cd6b.bin
70df788a4106d2e50efaae8effa33f946c891ab0ca9d21f9f1cf695553fbd53d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6B 17476 bytes
font_01_sfnt_off0000f9d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 16792 bytes
font_02_sfnt_off000111e9.bin
c6fc6c1d1d26ab7ff9d108d6bfc59edbce724dc010fad4414cbe4da5c625894a
pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 10404 bytes