Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b18bba4eec39f2…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 14:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4636162ce2355b6196bbfdbce25de507 SHA-1: cbb7ad4ef3f8cd045c76623b2d10c9af8c49544f SHA-256: b5b18bba4eec39f2f6505f2c0b07a46af70aa24204e280833e1cfab47da8b62c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many hosted on compromised websites or disposable domains, suggesting it's designed to redirect users to malicious sites. The presence of multiple PDF link farm heuristics indicates a deliberate effort to create a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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=electric+motor+and+generator+class+10+notes+pdf PDF link annotation
    • http://karate-talence.com/newsite/userfiles/files/rimawazojekevoleritif.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/58047826469.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/87365242770.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca1574745---43070657166.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f3a3a3d560ac0cf782e1ea4ce4ec8949/98076484965.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92cade1dbc---setegogefixad.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vl2i18jrhhrdffobc89e0vtrs5/sojagupepuvawid.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d36ee97e2f---61978096411.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c1dd12cfe---fumubowaropadasage.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/43138002975.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/wedasokopovati.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/narufuwoniwubarenizafeve.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/11497271852.pdfIn PDF document text
    • http://synphabase.ch/upload/file/12062707679.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xopakumebubimomiwi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/j3vouo6md4dqvj8oob6lb350b0/mojuzuketuxif.pdfIn PDF document text
    • https://promise-land.com/upload/file/tugitin.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/81f6b4e123483c6096ccd0eac83c833e/pakofuwek.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/21168345264.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/xajitebejepupas.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/bixepozesuxozaderize.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f80d7e141---xaduzewezisokosusuvupij.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/gaferonuborupigorifis.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_off0000d0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A5 11120 bytes
SHA-256: 822ab7da05ae18a82cabb414b1987afb56d7dd2ceb06cef07d736d2c8d46a28f
font_01_sfnt_off0000ea5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 16020 bytes
SHA-256: c9a6c332c82bce63850edd767f07529a74fe16a3bf7fda8aaca5176e475d41bf

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