Malicious PDF — malware analysis report

Static analysis result for SHA-256 6619fac1051b9d9b…

MALICIOUS

PDF

74.0 KB Created: 2021-09-09 04:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: b1037fa2baa8d5b5e30131b00c469d6a SHA-1: 6098f080e52a400c3c700e2f719f88bdc69f498e SHA-256: 6619fac1051b9d9b0793c6b0081b0113c7b9b7b9d5ececac67b029e9d0e88acd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The embedded URLs suggest an attempt to lure users to download potentially malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://snf.styleguides.ch/userfiles/files/fosipewosevu.pdf In PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/tonej.pdfIn PDF document text
    • http://findusafranchise.com/files/files/kulezuzuripesodezofaw.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/9549710502.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7528996225692105626eaac039b98dfb/jamod.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/lenimid.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/waxejoxelilabokoxeselamaw.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/radobofuf.pdfIn PDF document text
    • https://12shio3.com/contents/files/gobidavumaw.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/9550785682.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/milemigexogezilelav.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/27572716207.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/regozijewikirizeza.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133031be625d---98048788093.pdfIn PDF document text
    • https://campermagazine.tv/public/file/12028641625.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/75872775750.pdfIn PDF document text
    • https://phuquiland.com/upload/files/41061065427.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/53679125185.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/mudukojuribabow.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/73927815919.pdfIn PDF document text
    • http://le383.com/uploads/files/wodot.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/313d56f7571537bcf447b94aaa819ad1/58859284734.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/37716952072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=need+for+speed+most+wanted+apk+for+pcPDF 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_off0000be0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0E 17124 bytes
SHA-256: bcb77c69daaf4e71e20279c68d964a5afde2bef89062bd45fa0cd68e6049e309
font_01_sfnt_off0000e9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CC 10796 bytes
SHA-256: 2a00ac3d008e342a403490194faf54d3bcf80c95a5418726df233933ae76bb90