Malicious PDF — malware analysis report

Static analysis result for SHA-256 608c0f2e5ab7dcc1…

MALICIOUS

PDF

80.8 KB Created: 2021-07-29 18:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c354f7e1d2de71123f3785c1e75ece2 SHA-1: c8b4070f863a29d0e4e723cf5008ad777275b53c SHA-256: 608c0f2e5ab7dcc101b9a7f660d20ee232a1e2e357fe9b6637c388356d4d315b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript, which is often used to execute malicious actions within PDFs. The presence of multiple external URIs, many pointing to compromised upload directories or disposable hosting, suggests a link farm designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://bitite.lv/media/txt/122/file/kofowesewikenubag.pdf In PDF document text
    • http://dkkarsin.pl/img/upload/files/mabamatedise.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/kogodesuxulozire.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/xivevibajefokotiziz.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a387cb828e---xazotodupuve.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/73225746245.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609150c85d628---nigudijojagos.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5b69b2c9ea909657d56bafeb4c1e6bf3/64458601313.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/42356521142.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/80868738094.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/98869601545.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/mozikopu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de2545e160b---42768917505.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/rubepalawofelaxo.pdfIn PDF document text
    • http://emannsltd.com/userfiles/zesupitugowezavupu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609304142aa0c---tofiloweniwojezex.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/29046932771.pdfIn PDF document text
    • https://aneri12.eu/res/file/gemezopato.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/376d747316c1ec8e047c3b207cd86d7d/10539282758.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/72246825704.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/xizavisa.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/tubunudimuwobexenitimi.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/42467712512.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/86bd329609dd4af9311fb151a25eed1f/zatosoxaxilozisaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=englisch+abschlusspr%C3%BCfung+realschule+bayern+2020+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_off0000d19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 11452 bytes
SHA-256: a8dfefeb3db5a0e78992504e4a6c0140e1a7e045df7831e551fe97491670d4c6
font_02_sfnt_off000103fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FB 18164 bytes
SHA-256: 8abedcc27a8342565e48eb1511ddecf00b75aa6591f78f65e0eac47749347489

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