Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba38398638c4746f…

MALICIOUS

PDF

68.0 KB Created: 2021-09-24 18:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35059402519c4e100110ed07dffa66a8 SHA-1: da1eda46dade75d1335f2c33e9a3b2de4642b4db SHA-256: ba38398638c4746fc99a401f71b91a0483ea06c0edf5e47b5f2fe3721940261a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including a small file size and a high density of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=how+can+i+use+my+sd+card+as+internal+storage PDF link annotation
    • http://rassadaspb.com/new/files/file/92407355255.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/74268708000.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/2338253727.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/garirorazagudutuf.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/86599642252.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/tariwuzomoritatikelal.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/xiput.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090411213846.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210903131107.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630624010.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/13799112802.pdfIn PDF document text
    • http://voijin.com/userfiles/files/jewidapumixa.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614782fa2e5b2---luzaxelifojomazufelo.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/77229794179.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/77901198437.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109241201389003.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/63889773910.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ab63aaf95---ranud.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/89790835475.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/lisanapaluli.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/56494856289.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/dakisi.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141933c49042---supukiwugolofapuxanini.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_off0000ae70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE70 13928 bytes
SHA-256: 6be8f1d939ac86244983dcd23b72731bedc388978e2c78261224c0160d290eb3
font_01_sfnt_off0000d0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 11004 bytes
SHA-256: 330748be36db777666c6a79f74f83fac8465cf76a7b204a4e7538eaf93226116

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