Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2396d69a78daef2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 01:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9da4eaf129a881d3f22f1c28d7641ad3 SHA-1: 5c2048e7754097a3a77b93eae7525e4673752178 SHA-256: b2396d69a78daef2d3c65a527ee96ebc0a349ba125205023c6af64429204709a
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan delivery attempt. The heuristics suggest it acts as a lure, either by instructing users to decrypt a password-protected archive or by attempting to harvest MFA codes or credentials. The embedded URLs point to various compromised websites, likely serving as staging grounds for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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=how+to+remove+password+from+password+protected+pdf PDF link annotation
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/fd46b851cd13f98368fff77b849d4de5/19168646724.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/pepebawuragusoruwos.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/88670014253.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/96346098356.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/160102289296.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c0863afbfe0f5c1a892ac2990447eab7/21094570653.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1ff5095a---89759415996.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/i6enq3laiki87sjjv04udc8em1/bevuweberutuxa.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/6f37b1dafed8c3dcd6a7ca927d57454f/fikosojup.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/musaxaruvu.pdfIn PDF document text
    • http://beta-rc.com/upload/files/21311238148.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/mozinafamazokepifibezifu.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/2775348220.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/ziwebafolezukuvoridaket.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/marogamevemenikimifipuju.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/nazixufogodebez.pdfIn PDF document text
    • http://passionsavannah.com/clients/0/0a/0a61c075fa1d7d91f8ce2ef588f7e9ce/File/4870091150.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a0e2c720a---72103374848.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b779157cc62---19732566450.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f309c46c414f6132e7489137ecbdd9ff/19170670396.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/30927758528.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/91459066129.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/pavapi.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/m0dlei21e29hm8e4tkl8ctu4s1/gazonufug.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/momasoratafefoborepu.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_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 16860 bytes
SHA-256: 14295d523d7b2e264b74b7dabeea8f3376c31641e2fedd364e341aa105b29473
font_01_sfnt_off000109c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C0 10684 bytes
SHA-256: f776420945eb216db002ea87cc3fc871cafab765ca65de0da354ed8473e9af78
font_02_sfnt_off0001225b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1