Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41e384a2afa3639…

MALICIOUS

PDF

83.7 KB Created: 2021-07-02 11:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8bbb336bb0174ad29447b723aeaca30 SHA-1: 4909b008c9d7dcb331d8432a64ae733a95ead269 SHA-256: d41e384a2afa363960ae55de75a8ed50cf17a5328e64865d6e1f7abe01002bab
164 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 ML classifiers, indicating malicious intent. It contains numerous links to external websites, some hosted on compromised CMS uploads, suggesting a link farm or SEO poisoning tactic to distribute further malicious content or phish users. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=cisco+packet+tracer+exercises+pdf
    • http://robertfeinberglaw.com/images/edit_images/file/28325571661.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5b1899724---89893337080.pdf
    • https://baongochoa.com/upload/file/mekiro.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/33rvmck0t61glfg7abah1g51io/xoxeledobugigozu.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b519d1a5db3---labebovirotexenawagusukan.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ud62bvnbrsuahitohqagme2kcm/48220024401.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/fefifunoruviveri.pdf
    • http://painttechvina.com/webroot/img/files/badivakasalapisijomoti.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3d468ad6---ribugaw.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/828037419dee8bcb03f3c86edfb0f2ca/57360133759.pdf
    • https://locoffice.ru/userfiles/file/39292386350.pdf
    • https://razredna-nastava.net/files/5872935111.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c293d742e9f405ecbf803687089fd9af/fazofitofuxujegeminiw.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/b3617939a089a40fe703e574c385084e/94146752648.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8b98c93f---wopanelulimuvag.pdf
    • http://bhk-aindling.de/userfiles/files/kugefira.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/5204a72f8585d661e147bc341b74c700/biroko.pdf
    • http://rspon.pl/images/wyswig_images/file/72082637598.pdf
    • http://magicdiscoradio.hu/userfiles/file/dotajafiwexugesaw.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d798715324---xanosebisitoruto.pdf
    • http://adimhukuk.com/resimler/files/donejiv.pdf
    • http://brandnewgoods.net/userfiles/file/nofopamopizatiguravatuba.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/dbd7e85f61708683686e401afc1a132c/kojofimulijonumikivufi.pdf
    • http://harperfamilyreunion.net/clients/3/35/3566a42c83b0accea4ba2bdfee5c7976/File/zebexasupelix.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/2a91e822ce7d33ef36e8886a93f95522/resazogovetudogasaruxas.pdf
    • 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_off0000e405.bin
48230eba4e0db7a71211933faad1cb63ae759d6c829b42e6bd481c6c6b01708d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 17160 bytes
font_01_sfnt_off00011076.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 16792 bytes
font_02_sfnt_off0001288d.bin
6fe85ec1ec8317d83ea71415d705d0d7b968fe2f73ab413c8b88597ca00331a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1288D 10688 bytes