Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92db6ca345b94f6…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 01:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5ca97dab643fa21cc5348489a0c299b SHA-1: d1e03d2b13642d34054731be9772ebdf9a529014 SHA-256: b92db6ca345b94f62b2b2e96f7a1088a0b9a5c457e1b84c3db3b244cf5782c4b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary goal is to redirect the user to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=new+round+up+5+pdf+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE PDF link annotation
    • http://dioceseofniranam.org/userfiles/file/basolarewasefesovimozozo.pdfIn PDF document text
    • https://samudra99.com/contents//files/bigigevomogefepol.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/felixano.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16114f1c66f771---55070718653.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56bbe1f19---xazoroto.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/16792583655.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/18a653c35914d7ce8fd1a8e0e409235f/nozobukozovegejaxilipuze.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c03a9e5a89---sevejedukuzijivojuliwitob.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608163f78c7b1---sagikejajoribujudi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45ecec9eb---4263278512.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e9240822ac8---guzuxirikemevedire.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6164bfb312e64df2dc83ef06246a6489/rolur.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d770103d90---20981852501.pdfIn PDF document text
    • https://virker-ikke.dk/files/51995377687.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tahr6a0is7rlbcjvt7ddnv1rmm/zonawe.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/pigukububebod.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/0f64eb504c9cb91f1b4dc1334abca004/golubopesasutas.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f367f13317---gabokelaluvozina.pdfIn PDF document text
    • http://centronegozi.com/public/32369100245.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/22591553996.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16076a00a3531e---lazozuwikaxane.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/71625781557.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a241f4d671c---tawalenubipibetusurupiwut.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d2d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD2D2 16784 bytes
SHA-256: 9c89716f4a5deacf53df0e5bc7aa54e9bb1125440291bfa13bc00499a5308885
font_00_sfnt_off0000bac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 11564 bytes
SHA-256: 782b0eb34f5c347b90ed925a311be2c0d642850790747a7d0ab86bd2f5349e3b
font_03_sfnt_off000105a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A3 24412 bytes
SHA-256: c14db5decff046ef2ffbe1310720c1bf5c84ac043ffa088e4bf140b3aeda642e

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