Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d834453b96d9a7e…

MALICIOUS

PDF

90.9 KB Created: 2021-07-31 23:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2036a27de159b78f90208ebdeddc2459 SHA-1: de0b2aa6ed07876b1dd30f7ce1b2fa5091bc5dce SHA-256: 2d834453b96d9a7e430f476eeb8656e0f8e3261d4cde4cba95c1967e52bd19e7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to lure users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, possibly for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=printable+calligraphy+letters+practice+sheets PDF link annotation
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/48a413a5c6adfb2f0fddcb04511285e7/dejaserikaxifuja.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb9445f9bf---44302729210.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/lakudapen.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/76beb9848a62dc61d689c8d1c2c78ef5/74667178716.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/59369159427.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/40257c8c80de15310ad700152673e89c/8387401179.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/66762338953.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085c99e0d31f---36311742056.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/65136871587.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210515/210515235715274239lp0i7y247na8.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42166b42e---rexanopoliborajuxo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868744661f2---bivilig.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608897038d262---94534902507.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1832622a75---56809591009.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/a337bb07d7d7990d1fb9f6368cedebc2/99190339754.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c283ace0---33584818308.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7b63bae5---derovofosetex.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/sepuf.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b6026eda3eec3c7bee40d6f33c11503c/pijeminoge.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/rulidupivelu.pdfIn PDF document text
    • http://novichiha.ru/pic/file/10320912863.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/vusixevesuvil.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/32064073166.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/vokusugif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 17232 bytes
SHA-256: 564add664c8abc5ca5032844e3aacba6240a32766bdeae3387509d8d371e85c4
font_01_sfnt_off00012c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C31 10788 bytes
SHA-256: cae711840d4a66fb1fd6525ffb038c31980924af7a91c8daee4b2757f565b59f
font_02_sfnt_off000144c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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