Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9a6732a125b14e…

MALICIOUS

PDF

73.5 KB Created: 2021-09-07 02:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be2af79d1fa402a6c19289be9ad0fea5 SHA-1: 0699f3db3cd5574871f768bf56c6e14f7eaf83d9 SHA-256: 1c9a6732a125b14e45534a05fa850425a8357c3751fb57fc0e62af1533e136d4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://alphasigmaoverseas.com/userfiles/file/5359432273.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f191a929dc7---roposi.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/a7pv0qifecjo1bf6o164s4nri4/13174308240.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/96068474232.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/90923336604.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdaa8dce5c8---56529323470.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/basezunoridekufig.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be9bd6c7828---xezazemom.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/78363960740.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106030633299588.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/wikok.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/499d2e7712f70eafec737ee2e93255c3/80581551657.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6049a3bd---koxasaropuxaxer.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/25085842711.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/fovej.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/46744718915.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8158a9fdf---71801739937.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/gofikeduvokenefolizir.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/wevowobiruzo.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/2264580288.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d6d48d966---lovavovomamiwu.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/vaboketunajuz.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210825233746.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/kukovale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=macbeth+by+william+shakespeare+book+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_off0000bd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2E 16136 bytes
SHA-256: e3e315ead42d19f784e69762ae33d82375a63d13d81e9fe7b951a6e72195e274
font_01_sfnt_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 11204 bytes
SHA-256: 5b43e6a3007d91e98a6eddcc69ef6095571e784d1c13c246406ae71f713239e1

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