Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c33923f5f3098f1…

MALICIOUS

PDF

638.0 KB Created: 2021-07-07 01:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13b2415afe4d45d0031a37ebcdf07498 SHA-1: f4e7f6cf53bed4784fb157a28fd875afd9de36ac SHA-256: 0c33923f5f3098f183f51cd0e64404e2cbca2dc43198904d1dca8ee4dca6e915
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of an advance-fee scam. It contains numerous links to compromised WordPress upload storage, suggesting it is part of a phishing campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a lure for financial fraud, likely involving fake parcel delivery fees.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6613

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • 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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842ac977e5e---lebagavebanuzev.pdf
    • http://przedszkolenisko.pl/userfiles/file/46115584724.pdf
    • http://elsekmont.eu/userfiles/file/51033320674.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2c3b5a50---14417961864.pdf
    • http://sahamit.net/userfiles/file/zuwagekisur.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/74af2ba096783efc78cb4a24f5f5eda2/49014783637.pdf
    • http://kayamedbursa.com/userfiles/file/1881445645.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afddf1add41---793279798.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/damumewokelezi.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8g7ru76fndin4ocbolpsn0mt32/3466129534.pdf
    • https://hondamienbac.vn/userfiles/file/57440299708.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8c44d479e6f86fffefdc36748f29a2e/68209848157.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68d42e7a28---3249686047.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b783307a752---27926925435.pdf
    • http://syuncyoku.jp/upload/file/nisikogafumomitodenam.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/0l37jpjvsnct0g1k9nvmfhtqgd/59375412189.pdf
    • http://heyumpnd.com/userfiles/file///30806504565.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609468ac0a984---74889691299.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/43894441653.pdf
    • http://soflocops.com/clients/67403/File/tibonujenu.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/66699711027.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607607c7ed6dd---desesug.pdf
    • http://beijingbeat.com/contents//files/pegefaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ano+ang+micronutrients
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00098f52.bin
917d54dbd8de73106c633d4805ecafd1480e6bdbe2663a37cdddc5ff4eb6f101
pdf-font-stream PDF embedded font (sfnt) at offset 0x98F52 10608 bytes
font_01_sfnt_off0009a7b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A7B4 16792 bytes
font_02_sfnt_off0009bfd2.bin
b0346285df1de0a1d695ac7aaf4ed09e01fd4ea6d2a1bdf6bfe26852d383dff2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFD2 15548 bytes