Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecceb6ae1923ca4…

MALICIOUS

PDF

83.6 KB Created: 2021-09-24 08:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6c64b6feb93a2731dd3a296f7e8bad19 SHA-1: a757fcf4f8a9668962131abcd7e6d843bd29d118 SHA-256: 5ecceb6ae1923ca4b14728aac49538bc81094326e47808bf14a0b4dc56455ddf
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure are sufficient indicators of malicious activity.

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://infrive.ru/uplcv?utm_term=dr+fone+crack+code PDF link annotation
    • http://canissapiens.com/images/uploads/file/89472106591.pdfIn PDF document text
    • http://espokebar.com/uploads/files/31635771122.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/peraxoxaderosag.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/sifiwuwusewegod.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149162b4e270---vumusopuzosunegomijufuse.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acba9f1f1a---kapalatozepebidof.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/jibanavosug.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/fumumovoribinopopezu.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/mulavowefadiwadomat.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/95044933977.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/68776628601.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/83222974700.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/zegase.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/13097170623.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/makuzejevisilozijonivofu.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/lusegudotosa.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415c2dbb361---49777787702.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/37109798659.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/69434976988.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/kujudepo.pdfIn PDF document text
    • https://istanajp.net/contents/files/difenefivelogudegugaleta.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210902044731_tuhbm5.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_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 17872 bytes
SHA-256: 4ddb7e306a2559593a4866b3971a4f40a6c640330518dffd050714c1c5ffeaf7
font_02_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 10160 bytes
SHA-256: 47ebd657672411c68e82cfef68690ec00d50da37663c610f0420909b2a779239