Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afb4a82790d68eb…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 17:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b2e4e9bf3a16b00c808e157093d9bb2d SHA-1: 56a97b34d548723fd51c63593630a059216e9073 SHA-256: 9afb4a82790d68eb323ea6e5badda11bb16551f003abbd507fde3413fb051203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites and link farms, a common tactic for phishing or distributing further malware. Heuristics indicate it's a link farm on disposable hosting and points to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://allytemp.ru/uplcv?utm_term=handloom+industry+in+sri+lanka+pdf PDF link annotation
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/33009773263.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210725221901.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb09c1f233---93252989817.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/mowesaronumorejuvawubir.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/13613089470.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/nuxejijoxefezojiza.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/47755372625.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/64155836284.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/pinupogozir.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/gukogarawajoxiwesatewa.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed89caaa53---57321452023.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f4fe1d14---didopuloburapezedarob.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/34233090725.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161184c474baf7---senafemezodavituruxatuni.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/dezikagese.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/eaa2919172a76ffe54285b2363f43d78/xoxopazemexazebanitubamut.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/18141664966.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/47796717425.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/19107565745.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sp0494j2drmovf8l9ai1g8p5h5/wisanunorodusemunu.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/29842621856.pdfIn PDF document text
    • https://medtek.vn/storage/file/jimabugedixusimazog.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_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 18716 bytes
SHA-256: 868b4ffd5b36d11423e8bb780e7b56b46880f040622590771977954844b4e106
font_02_sfnt_off00012151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12151 10824 bytes
SHA-256: 7388b6600929235272264e93b542832aae9b858c38663792516d9b949192010f