Malicious PDF — malware analysis report

Static analysis result for SHA-256 60d53224764498e9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 19:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9647c74ab1e3c6b5509d45c229396185 SHA-1: e75edbd7f08297bf389047e9b38391ca24c33ee7 SHA-256: 60d53224764498e91ea858ae000375117ac075dfa1b7bf73f8f730c18ba9fe6f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://shengyaweb.com/uploadfile/file/2021072318494796.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d16605c5ed70d19d14b1b87b54ef4680/87092928996.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/dezixuluso.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/towozajutonijumevipojuti.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/remixibogazudolifuxobeg.pdfIn PDF document text
    • http://thegioioto.store/upload/files/78654562288.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/8568704037.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a654003785aa6cf83671444cf639e1e6/wabujisigixilivaf.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd59da8233---paxizif.pdfIn PDF document text
    • http://garderoba.sk/images/_file/90811381763.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c19b274b4---soliruf.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cc9f60145---xeratuniloju.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16083dda45a9c8---35689318812.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b80a689f3---nalukexasotisobapive.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abc4957972f---jazaramubopoju.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/gagowojasubonitaf.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/bc45c5b82604204e576235dee6ccde0d/tosona.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/p3dq32uh2p6uhfe6v1681f6o9l/94611261541.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/d8f24300d7970856d5054ce69356b3f7/65033187737.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/funigatibevu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3958eb373---wimenazuwivabusu.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/49094588848.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/56139989923.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/gariwukuzubodafo.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa5b1bc45aff029038a5d5acf7d8902f/geterizeragojunageriju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fun+adjective+worksheetsPDF 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_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 17656 bytes
SHA-256: e2046803f8234fc3d0b318db29641c5c203409c67ad8ec6acec067ee63189d04
font_02_sfnt_off00011fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 10872 bytes
SHA-256: ca2715e9fd9db94852d20f246208cca7771dd571707a6c4b1690d17069c80b2e