Malicious PDF — malware analysis report

Static analysis result for SHA-256 e111a045f9fcbac1…

MALICIOUS

PDF

100.2 KB Created: 2021-07-03 12:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0dc1765a5ec04a7806e1fd90e6e31737 SHA-1: ee71c9f1a0aa62375b28eb03bcb7f054ca53f58d SHA-256: e111a045f9fcbac16ab8946bb012ed25240480344bcf61a03dd3f53abddd55b5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised CMS upload storage, suggesting the document functions as a link farm to distribute further malicious content. The PDF structure and embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=30+etudes+for+the+string+bass+pdf PDF link annotation
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072e5fa4f544---67139210712.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/12934363489.pdfIn PDF document text
    • https://peterdegendt.be/file/39240666091.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/pinipurevajewivirodusobeb.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/jezamosekunigazobuv.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095426bc065f---lidesiwizaxotabewewejime.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b75d481fb---lerunenepatuxopofekixek.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb62d2b540---31498335034.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b03fa18b17---2971101359.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/fudoposi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160819e8e0ccb0---78727738506.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c10f786838b---48684955615.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885f0575c7e---54209612004.pdfIn PDF document text
    • https://dm288.com/slicice/file/92747456776.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e991604b8---41103382947.pdfIn PDF document text
    • http://fullx.net/files/lodojaxukivogo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96643440ec---71253934906.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/86844612911.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160de070069816---43665371658.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083339f96032---54338445857.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/8g2uclpfkve2bj3k7dc2tgj4m4/21249446016.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa2cdff4e---wejezomepotusakitudew.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f8dbd62a0970b7ae3366796b84a818eb/kovolasojopumowotitufi.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011cb1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11CB1 29236 bytes
SHA-256: 4225cc4420a9dc652d16f7725331ea9b4ef0df21d85ca2f5a7cb82a27b9cfc1a
font_00_sfnt_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 18272 bytes
SHA-256: 7e771ec59df71c11e7abb0558bc0f9bd43b9f84525c66664ca88e60f4fae608d
font_02_sfnt_off00015146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15146 11168 bytes
SHA-256: fb15162edc2c680fc9d233f2856b27d4e537aea59a863fe7ef5a31b8da2bec29
font_03_sfnt_off00016adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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