Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4266419a83e3ce…

MALICIOUS

PDF

87.5 KB Created: 2021-07-18 01:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44656cd771595eb9dce0cb84f40f5e85 SHA-1: 591f6e0510acc927b120fe66be0a5f468f9862a4 SHA-256: 1a4266419a83e3cef00dd321873aaa726ab2f991a19186214f4ec1fe4343b4a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a malicious payload. Heuristics indicate a high likelihood of malicious content, and ClamAV detection confirms this, flagging it as a phishing trojan. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9547

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609901f005e20---golavorekarivifefajo.pdf In PDF document text
    • http://npi-management.com/ressource/site-image/files/xikafas.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc451c9a08b---konanuboretaxuxun.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0cab51087---80276484972.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2afaacd39c---vogagufezot.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/aa075af08f19b9ebb2045996d2762521/fudugamigilovukur.pdfIn PDF document text
    • https://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/puwaxulewonarafafutamuku.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/nevupavegobemadef.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/86802055210.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/33410779606.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/kozuxofujidekuposaxi.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/vazibotarowupe.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/litobesajebosenufo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e32f12e65---21324939057.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/sebiwutonuwevuzi.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/5288224725.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4l2aha6dqassbnklb3qucq89cd/janadesolexafejilubid.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/58787478003.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210518/210518190627076845ulc4g4l7xr0g.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/6348541402.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9830df73c77c270867e457580ec9fb8c/30893850303.pdfIn PDF document text
    • https://digireg.cz/upload/xonifukovetulofobinuwowez.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/sidekalalokugezapijufa.pdfIn PDF document text
    • http://hodori247.com/uploads/files/bilebajebono.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/695655aad51ffb3ad9bd838cf0329398/siwivagetepivugobaziba.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b6ecdccb---ziluvanuxizoxewufofisumur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sao+ordinal+scale+downloadPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE22 3504 bytes
SHA-256: 1e9e55639d4f11dd2d990e7581412d49863e5925a0236a2cc9277181ed6e385f
font_01_sfnt_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 17836 bytes
SHA-256: 1bc3c0f320ab38700a2abb7008452158e24e6fe8cb741f74bc27aebda1fcf0f6
font_02_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_03_sfnt_off00011ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 10428 bytes
SHA-256: 260f9446c044fc47a1aa9fc3cdda7b88d915e3af09f13a6d03886b42c002648a

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