Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93d2c3083377fba…

MALICIOUS

PDF

92.1 KB Created: 2021-07-21 10:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97b95fbea90ab3208306241e99ac0bc7 SHA-1: b947d3cefd3fc227f9620c1241dcc9c7ecf3cd67 SHA-256: c93d2c3083377fba1c76411a447062c0cb86cd5fa4f6772b95cfbea7a073406a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or to distribute further malware. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://tasarimak.net/ckfinder/userfiles/files/barupibifijaposanajipawe.pdf
    • http://delvalle68.com/clients/54584/File/kekuwuwudigasarajox.pdf
    • http://akinmedikal.com/uploads/file/mosofuxizeruxutomizogafag.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734e49ae176---93626634588.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/878d08f042a8a880ea977c65394924d8/zetuva.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jaeh4mlm28ko829m6krqcfgod4/gisuzebasusirajabawow.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f363455ca---99404830157.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946c4d0a732---70472760503.pdf
    • https://tenfci.org/userfiles/file/golununimubelokupo.pdf
    • https://sca-kc.org/scauserfiles/files/kipirefo.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ac973789---82744940958.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95ec4a7f63---3443866057.pdf
    • http://aqcons.vn/upload/files/getawew.pdf
    • http://www.niziointerior.pl/upload/file/26203268229.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa84411bf86---46647597665.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17ccc89cf0---689625423.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c430feb4217---74340238714.pdf
    • https://www.alapan.org/fckimages/file/24534226620.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160776b8966bfb---nalorali.pdf
    • https://mintowncoffee.net/uploads/images/files/bewejuwemosizabesez.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/80pus3aknsui8e24hhvrt2907a/vefedofakulevubexiwizidun.pdf
    • http://teknis.it/userfiles/files/53868486014.pdf
    • https://preciseenergygroup.com/media/75240093305.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+to+the+isle+of+armor+in+pokemon+shield
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ee.bin
fe8916f59cb969ade2698c599f785e9762f30c4e0bb590d54fc0e0e5f0b1d448
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 11116 bytes
font_01_sfnt_off00010c80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 16792 bytes
font_02_sfnt_off00012492.bin
ef666a4fd6dc9a36f9af38b3d5243dc9bb42a7442c41c77399f5ec9038a1f081
pdf-font-stream PDF embedded font (sfnt) at offset 0x12492 18216 bytes
font_03_sfnt_off00015330.bin
a55a55ff63fd4ec168a086654b2a069b318c62a7c4744083f37e86211d70b5ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x15330 3796 bytes