Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a172ae2eeb098dd…

MALICIOUS

PDF

91.5 KB Created: 2021-07-02 09:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6722e8ecb3a697cb250db6cd4163c8a SHA-1: 549d166ada6d1fa0944b9d74646a8cff8ae09ac0 SHA-256: 5a172ae2eeb098ddadb3a94afda9964085b716bc5502ae7c11d24fb388292b17
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. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. The PDF's structure and embedded URLs strongly suggest it is used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://oniceh.ru/uplcv?utm_term=small+scale+archerfish
    • http://abroadster.com/files/fusivevurinetoromalal.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df651d3fc6---84127538011.pdf
    • https://smartcirclegroup.com/userfiles/file/23199603005.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e4e110057---likobisepukowivep.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1236f4a075---difasasa.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/hkkqb3gk10d19qk1ie0chd404p/fajosujeruredutige.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/61454aefd4c5b0bb338c0ca1a91d9da7/gigagetowifivomosozagijaf.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/6025ca57c97c32e4b4ced545e1eae100/33448389715.pdf
    • http://anupbolivia.com/images/files/mulixo.pdf
    • https://capital-tic.com/upload/ckfinder_temp/files/20210529203502.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0453e797b142b20e4541d9cdea1f1442/84514635711.pdf
    • http://bruntpratcher.com/clients/4/41/419cf983043b9371e8393ecf97d676f7/File/90988103921.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd73992a1a---tiduzaxe.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/ziwufuf.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/lhdh0ntveqa9mrfkseo3amfpb2/56645592942.pdf
    • https://kurek-rowery.pl/user_pict/file/fesobogamekoxerokufoxe.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a00a1a34ef1---94211996771.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607863e91a67c---67931514945.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a56425c82---nuteserekibipufixi.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5dffe1b135ddd904eb5f6cd6c22d8769/kokumupexib.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c3be01083---dovutilunivazeluwatimu.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501010857427020.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/21949bc6eb2298a65a4290aa46716e26/wufekar.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/984f65dd9a7808a691f4404513312c2e/17014105723.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839629879a4---jixaxumeg.pdf
    • 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_off000103d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 16792 bytes
font_01_sfnt_off00011be8.bin
12837bb9c28f21759d095ee2a47ba172a1e0ee881547f63f9b877fa8485dbd24
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE8 17684 bytes
font_02_sfnt_off00014989.bin
fd9a1a369ef452b638017a3503a6a7922dd76595b943ada5d474a7d724298cef
pdf-font-stream PDF embedded font (sfnt) at offset 0x14989 10352 bytes