Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d2e4a748cd256f…

MALICIOUS

PDF

72.2 KB Created: 2021-06-28 17:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 950b500b02ac5aab57a0b53c0d90ae53 SHA-1: eedca31bc43a83960a135fe87350c39384a54fbd SHA-256: 15d2e4a748cd256fd6fbd7dbbaab90408c85db646c3468942e842037f690df10
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • 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.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac4754083---2339272513.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4e609f6a1ce15b5e52f9c0ce2cb5b2d9/71626896210.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070e51de79ba---65556402519.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/be69bf9133c123513c6ba27527fb4759/8049652308.pdf
    • http://medicare-darmstadt.de/bilder/UserImages/file/12812552518.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072f998ebe33---72482774847.pdf
    • https://jackyrouxmethode.com/userfiles/file/66435465472.pdf
    • http://obasekiestates.com/UserFiles/file/99306969257.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/mn8j2i2hk5d9pvmlq26g4u101p/34249986569.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ac412582c---78340719267.pdf
    • http://assushop.com/userfiles/assushop.com/file/64349220595.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/20389bc66111512a42d6a3098afdfe0a/lojexaxomeketofurumujuso.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c73bb8d189c---filamolef.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/pobilufe.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/5a1epmijpf9qllnvc4afmar29n/57847846494.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2157dbafc5af761c9c32c0c3308f36fd/fulegatesavepeg.pdf
    • http://bitite.lv/media/txt/122/file/83771538733.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/19f0ae4ff20a150be42a8c30ad26d7a2/fefasufedaxotusukax.pdf
    • http://usagimatur.com/files/others/23058543650.pdf
    • http://tiwtactic.com/userfiles/files/varebomamukegupidalomudiv.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2199ee7d18---76916461412.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/zurekisikepufi.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/qfvs6r2rcjqt6ibuc9q69mj0fi/dotezewapavotunepimolop.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/c4v5g7uba9eflubmr43shhvb51/36191453344.pdf
    • http://btc-ltd.com/upload/file/93183421729.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd629130be---4017174162.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+business+presentation
    • 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_off0000be94.bin
d4604ea82ec8cbbd1cbd5bf746bc002dfda9907eeca8c21636d5298b6d38607b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE94 10416 bytes
font_01_sfnt_off0000d615.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD615 16792 bytes
font_02_sfnt_off0000ee27.bin
f1c632631bcf573d5b4b5abcd0852172031fac4287c002a69ac3243deaca230f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 14736 bytes