Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c25d7886d2bc89…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 04:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a0bf16e3ce3a6fdeb6fe0a10836a018b SHA-1: f64feb2db5c4203edbebe0f98d3e69f3ac9da023 SHA-256: d6c25d7886d2bc89b442653401fd290fda87bb38fe7eca1031080e91a8e089fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of numerous external URIs and a link farm structure strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.pharmawell.eu/ckfinder/userfiles/files/potopa.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1429c533b8---39874215256.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/xemirovaroder.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/dabunokofozuju.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/vdam0i3hueq6b4ibnuf4aj9no4/pegikawo.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/91196284207.pdfIn PDF document text
    • http://mylodge-naoshima.com/fuxewotirotovezodibo.pdfIn PDF document text
    • http://learningkey.org/userfiles/tetukiz.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e8f988164b97fff72c135c9350a6ec25/gijoxi.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/robuzoxukax.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95fa9a6dc---62865158820.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/j1f075b7cn6e6n6677bhrudro3/45843977356.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ec42fb18---bakuporoxagidenizewad.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/pewuniwisolawa.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/tubowifidewegezap.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/xuwow.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/renijogu.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/014c81cd5974c8489cfcbb8b192730db/paserimawozexowamopi.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/91938084531.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ba99f4c1792cc2b9839a56a45a4b0dbf/62313625946.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/bujizetit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=copy+paste+from+pdf+without+line+breaksPDF 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_off0000c3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 11328 bytes
SHA-256: c1e5c3648e7de1506bab49dd6522d86f1c9baf2512aa4d5cb2ace8ec3ca1a3f3
font_02_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 17824 bytes
SHA-256: 75f8ae982227ed86065aa1c7e9964d8e61d9f0603e5146df966377e3de2dd337

Open this report in the interactive analyzer, or submit your own file for analysis.