Malicious PDF — malware analysis report

Static analysis result for SHA-256 876c3e48dd91f25b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 10:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35aa7a8491ca43c19693110cae4b224b SHA-1: 8fcdb7478f5800293d1f8ba00bf1b81371a74cc3 SHA-256: 876c3e48dd91f25be2972913a29be95ca21a2888e339aae65e8f0dd8e3fe27ce
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised websites and disposable hosting, likely to trick them into downloading a malicious payload. The presence of a 'download button' lure further supports this phishing-like attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://diphong.com/uploads/7051758018.pdf In PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/10a65cbfd9ea13c0ee1f630e1a449f02/bemuzizilexobobikajiza.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/64101580265.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/v42p5a7rfiiu8a3k1c3gek6idk/liwegiwudifuramumoximel.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/pekasurur.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/66373451649.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/28177327156.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c1b8ced43---dogewativokufe.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/puwurapel.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/komesijakufabosinetekuxax.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210626054602874.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/72669324042.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16085485795433---kugika.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7528373935601eb5d0a88d630466cd7f/sodidowaxegulowog.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/xapupexabapefezisedunil.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/66869979351.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/xosojabefugabagi.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/vujosobesezasifavusubamov.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9da00e5ad---75861594997.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/42616114898.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/nasedojiravirug.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a2c5d51f8324fab99f829da0b61d2c88/xetuxilepulobakisozir.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/23299618946.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/pofumaxadilepiwato.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16099a4a7b9289---72438696482.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/figufapilig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hsc+chemistry+question+paper+2018+pdf+downloadPDF 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_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 11824 bytes
SHA-256: 386ef762ddc77be326c9d50982299a91128ff2c96378e693d235b3bf25931a73
font_01_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 17800 bytes
SHA-256: 4a409bca47eca117e54325428ba4a3bc9ca8b5841d6f9bb3d0282dc45cf930a2

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