Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ecb589575d9036…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 16:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 183359bf0ca2ac4e965111e05f96ab5e SHA-1: 40d69f8bc7ca89646e0d210e2110f263954fdbd9 SHA-256: 38ecb589575d9036d3575e229822d82e11e075956bdedfd52f28724a61a5a538
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that point to various websites. Some of these URLs are hosted on compromised WordPress sites, indicating a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://pistant.ru/uplcv?utm_term=how+to+remove+pattern+lock PDF link annotation
    • http://auto-rad.pl/userfiles/file/dekajosizifun.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/40848328547.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479c00d1851---wofaxiwujekimevam.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/pufadejomekimudufevebepoz.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/zuwediselifaniwopalagejol.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/41438820373.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/3645498650.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/84001688335.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e0b0f8b9---kawiwuwefurisafa.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/d4ab6c22a29d79b0eccf7ab20620eda2/sorisexogajewikurowotova.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/zitekama.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/38746049712.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/pijodoze.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/dodafejebevagumizuwudu.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/gujirufulikoraxuser.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/fowilu.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/54840737025.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/43838064076.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/51763874897.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/75668026039.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nkf27r9lv67qqiu2aig07k4avk/36890064883.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/gakawixu.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/33218680197.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/mapudejonokutazonapa.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/20794321983.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/gedabe.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/59030507606.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_off0000b376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB376 10512 bytes
SHA-256: 7f0f1205419bf050869687f2d198033c80fcf64b78702e6b680efb8058a3df0e
font_01_sfnt_off0000cb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE379 15228 bytes
SHA-256: a98355daeb201323460e6b55c5f6b14f72a2534d70d3acf3371b1be57ead13d6