Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e7dc1f463ed0bf4…

MALICIOUS

PDF

86.1 KB Created: 2021-09-12 20:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a4171f78611efcb91b7bfdb6fd77db6 SHA-1: ce6a6d24d549ee45a0c05d89426a1575e5492272 SHA-256: 0e7dc1f463ed0bf4947f754562764400adb10f7e08765fc064708afc76c2c65b
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=watch+dogs+2+apk+free+download+for+android PDF link annotation
    • http://donghozibistore.com/luutru/files/81847856449.pdfIn PDF document text
    • http://industrialdevices.in/uploads/5211615277.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zapozudifolamokevilu.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/53225068801.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/bowegisoxomaru.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/11446999915.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/tulupezexategufa.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d68216902a---23677580417.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/38330574199.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/93440713104.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/62090422603.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/40146aa469a91decd41f84d04a5ac125/wisigalagizuperoxib.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/62351879446.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/gevegezux.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/79792753137.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/40240549286.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/15679814417.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/91205391648.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/vesisoko.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210912103416_1300205742.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/67261085454.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/solilonawuvoke.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/43689280061.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/9554286212.pdfIn PDF document text
    • https://begili.com/uploads/image/files/6542668155.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/38ef1a3484f9b5bfc945dd6a5c1f62d6/10677100585.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_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 20544 bytes
SHA-256: a40a24d93b10ab6424d1c800e1994f494fc9f85f20f8eb420b8fce82983d645d
font_02_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 11188 bytes
SHA-256: 21abb6d27bba97e32f13426fb52c79d6f8dc496a91a1935a316fc515bf7b9a85