Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05d4be61035b666…

MALICIOUS

PDF

86.0 KB Created: 2021-07-04 21:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 61ac6007741d8cf197717293e7bc1da3 SHA-1: 63c15f956611042bedb8b62c504001960878eaf4 SHA-256: a05d4be61035b6666c5b5bd216bea9d146be1a93964d9a137d9996fae7ea6f81
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristics confirm the presence of a link farm on disposable hosting. The document's primary purpose appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a80bcc6e080---29456723425.pdf In PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/24310689288.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/gopevijigutowobogeraf.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/95242097072.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bababa9ceaa---kulizawiliwudedutorubip.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b560c761c64---17646674961.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cc0c855a3---govamuzejilul.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/82r63k423tlv6s5vnvlhnaig0c/jemagofad.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/kekudokerewikemifab.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/fd8d5cc493f4df71b78188565136b07c/4607783392.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/4283318700.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe1de582c3---47929803078.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bb924e0ab---xidulif.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/3pemd126n6uiefchmd6hjfv03t/xoxepefazabijogorak.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/kugizuwa.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/bivotakozuxujereb.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/bb9b425196fb307c7bdbe2131a50136c/40468792072.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/7986583894.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/76aa031381e32ade2b0d6f226f0945c8/41547403992.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/67768775901.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2d3b5e86f---53699828482.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/tixoradopopejilodube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=d%26d+map+of+the+planesPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 16148 bytes
SHA-256: 9dbd86b547c789e693a9447677f94902def939eedb7b34c80af7161f7c191d02
font_01_sfnt_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 19040 bytes
SHA-256: 9d9d01402fb40f8f19d5f6d6606eb75072d42d04c57bc8fc5b8c8c25fa246a3f
font_02_sfnt_off00011755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F62 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_04_sfnt_off00013779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13779 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8