Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d3d0137684fd31…

MALICIOUS

PDF

73.1 KB Created: 2021-09-19 19:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b31f5472614b0a898da2b73c9bfe5822 SHA-1: c0cc93860e7bcd561f892b1e7bc716499a5dee8d SHA-256: 70d3d0137684fd31622739d14f29ba8d0a03e0c98f9e23c8b7f02a919ead6a5d
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs that form a link farm, pointing to compromised CMS uploads and disposable hosting. These links are likely intended to lure users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://studiorapizza.it/userfiles/files/9247214974.pdf In PDF document text
    • http://jun-travel.com/userfiles/file/boluxorija.pdfIn PDF document text
    • http://precisao.net/files/files/76298461527.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/valuvejasijepesetijas.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210912075730.pdfIn PDF document text
    • https://csn-alliance.com/data/files/31871716332.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/tojamilitapadegikobivet.pdfIn PDF document text
    • http://bwc.lt/i/9813355392.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/89153278721.pdfIn PDF document text
    • https://best-label.com/upload/files/xufepanetefesinabopaw.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/vukutarowefopaso.pdfIn PDF document text
    • http://nhadeptannguyen.com/uploads/files/lisugojasorerapelez.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614642a9bd2ae---wagobus.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/duripunerirituk.pdfPDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409dfb91d96---sowukerodegufinidumoze.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/jawoletizateredulorowami.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/pamapagukepuvapo.pdfIn PDF document text
    • http://artediapharma.com/upload/files/zibowawalar.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/59583023505.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143bb0305843---27449393078.pdfIn PDF document text
    • http://indexone.ru/upload/file/zojupejirisagubobezavinu.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/guwinotemenujaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hanuman+chalisa+marathi+pdfPDF link annotation
    • 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_off0000b6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DC 18648 bytes
SHA-256: d510075c4fb1e0e7ea5c4cffcd11bc8554c204a2734992a6b4d95c912163c093
font_01_sfnt_off0000e6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 10724 bytes
SHA-256: be8b1369cd6737ed873b029961a43419679da31bef2fd1f73e67147cd5190bc1

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