Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67b5d3c27d7b174…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 23:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 566248da0e6f837eb2e91620d53afbf8 SHA-1: d3546acf50f78ca7eb7e9feb5aa08566b33a925b SHA-256: e67b5d3c27d7b174ecc9c44e16aec4984f794436ceace0171ad6eb59c84f2a9b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious sites, likely for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=swiftkey+keyboard+apk PDF link annotation
    • https://vetregistr.com/ckfinder/userfiles/files/potowibodu.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/nikamowesamefop.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/82945787563.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/63178785174.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/30085100929.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/rademuzotibo.pdfIn PDF document text
    • http://lgassociates.in/uploads/35952758313.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/77025154273.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/72961591980.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/58260613251.pdfIn PDF document text
    • http://innotack.com/userfiles/files/48371323998.pdfIn PDF document text
    • http://olympusflights.com/files/files/31829440722.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/011706093510.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/71705896953.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7ad173030ddcc489bee5c6b304b4760f/rafupajusezo.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/faferozulubemoxonajijom.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/42270380369.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/bivuroxij.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/17085233205.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/286d650734bbabe07fe88394158ec510/xogisub.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/66926833622.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161508b4ba5fdd---65164219497.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7df7d88b353fd463dcb30dd61fcebe5b/88007882621.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/655566326614d6862bfad3.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/85127549708.pdfIn PDF document text
    • 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_off0000b3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C4 10680 bytes
SHA-256: d6a494bbb37cba15235e57639b48dd35537da2da724e479938bf6759b0cea2fa
font_01_sfnt_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 16068 bytes
SHA-256: 53f3d901b7ac52b531176765b5ee998627d51c4cf600fd4e82083f12dacdba73