Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d4d28558c9dac2…

MALICIOUS

PDF

77.6 KB Created: 2021-06-26 19:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a0772a319695bf3fc53410b50db15d5b SHA-1: ddb2adc8358a6732311cc73b4719b12b9a9b025f SHA-256: 48d4d28558c9dac23231a7fad62f4831dac011846f01022fbc0607b155a3e2a6
124 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites that appear to be compromised CMS uploads. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or potentially download further malware. The presence of multiple distinct hosts and the 'link farm' heuristic indicate a deliberate effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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
  • 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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82a1c91a4e---43834941933.pdf In PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0bb067788---nenikubelobajagugez.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d4e979bc2---zeritetoren.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/43387519444.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/6b0b06898f39fd239c18e1c7f589c105/71531006438.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a562458502b---reginakur.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608720408ef77---zutuwatozutonamodifapi.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/67035290818.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/7jt46vl580nhgqveasrhar3oad/90954196126.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608340005ab8b---jizujofitisibebu.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/esu5g58qqorpj1m4ap90hq63t6/87916437457.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/nurozorasuximomezatasoban.pdfIn PDF document text
    • http://abpaluso.com/upload/file/ferudurovimenug.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3569176b3ef7de064880d887114589d9/tewulaj.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/tuxirunim.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/63486333193.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9a7896874---sinefali.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/3afeba5dda0925daec32d39808abe3a2/tavagategalebesesawinuwif.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/62f0d71fffb45b8db6f051114851dd34/25557876932.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e796f4a7f9---86605649317.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b013ecb9a6c---wenekumugelabixag.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/rpnou5c8ob4jcu9h5ig2r66rj2/wuvokufotujabukolulofiw.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/779048d19b125e9ec7ba9e757a145233/vanipijaxufuxatenaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=acnh+how+to+get+amiibo+to+move+inPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 17672 bytes
SHA-256: 87afb15672b5a9016e7e83f30abcbcb6c855cddd5211537fd314eb11ea6790ed
font_01_sfnt_off000111dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 10636 bytes
SHA-256: 41e92d5ca24ebd4a2cbed6c91fa51bc1c788ff1ba1d7bf072a61ceb73c64eacf