Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e031fbbaefed710…

MALICIOUS

PDF

70.3 KB Created: 2021-09-19 20:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ff8273a40745f9f8331682ad7f43aa1 SHA-1: 468034fefd38a4306566b4858214f6d0440ab94b SHA-256: 4e031fbbaefed710c96442eeef0331a7ecb5426498ee970fc9cd5a3bcf919f2a
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier. It employs a common phishing tactic by presenting itself as an image-only lure, encouraging users to click on embedded links. These links, such as http://goldendoodlesofthesierranevadas.com/userfiles/file/nupotarex.pdf, are algorithmically generated and point to compromised CMS uploads or disposable hosting, likely serving as a gateway to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 70 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://wastran.ru/uplcv?utm_term=shindo+life+private+servers+codes PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459c1e47bef---51229394187.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/36033982093.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/2944381211.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/kauseculs557sn2lhjltagj9h7/73743917891.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/fejewuzevelikarogivo.pdfIn PDF document text
    • http://canoeing.by/pics/files/10385173387.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/nupotarex.pdfIn PDF document text
    • https://angkagenap.com/contents/files/xazifofufakaranivi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8dbd3a3a3---xegidozesomobivib.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/16312901719.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/30141279805.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/92664562562.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/nidepumimasifodadobuxen.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/95641137898.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469858bf207---pegowufakanepabunaf.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/buxarobifesasetabapiraj.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/16904729838.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/9066367120.pdfIn PDF document text
    • https://812423.situshoki1.com/contents/files/mowogigafimarajo.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/bd8f0d35a4204a5bdd7abb9369a3ecc9/bewodidototaxu.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/81860691744.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/kerilewelenorilifin.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/tajekokapurajiduwesuzux.pdfIn PDF document text
    • https://renewone.de/files/12560421247.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161369c2b2181a---63772874892.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/vedaxegogebepufuvesa.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_off0000b6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E8 14024 bytes
SHA-256: d15c61fc3bd63af83327be85c015e9e05b4bae47532521e000049ea57f1f6667
font_01_sfnt_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 10860 bytes
SHA-256: 37522ff6b77c3a3dfee609f91cf9a4c33aa629450cafe32220489471e611dcc1
font_02_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1