Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ea01097bdc9a0e…

MALICIOUS

PDF

130.9 KB Created: 2021-09-01 06:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d29e88a819db5ed2d8838faad46c70c3 SHA-1: 56db2f7e2adf166dd9ae30d1e04cfa0a71c54528 SHA-256: 25ea01097bdc9a0e3aebdd5d72d2d92910061a5b2e23f8bc9177179ef34d9ed2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that leverages a link farm technique to direct users to malicious content, as indicated by multiple heuristics related to compromised CMS uploads and disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d9480d2bb56823f09b4e81df45d7c58d/37163869624.pdf In PDF document text
    • http://jcpingie.be/public/files/49241820771.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/dadatarofoxiro.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/silalegegutirorajelevum.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/27742572948.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfef934889b---22746546564.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/dolewulivar.pdfIn PDF document text
    • http://adveotec.com/img/file/13066724029.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bed6b6cf2a---95236506333.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///154612903.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2af196a5249de1ddedbede15a047d52b/notazarijuzuw.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021081203300466.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/86566623759.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa66f0bf2e2---kegobamezidabidepow.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/68693280738.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c0d756cdabc3032656cfdc0ef240a61b/82959118351.pdfIn PDF document text
    • http://aimic.com/userfiles/file/bipepifinikuf.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/79962470619.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/zulesegijusizipowoxav.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/sjfs2ctjgs446uqq42c2u8k3jt/runitogodonuzijiketel.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/96129994963.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3f8b3eadcc12c91428d28daf3e9a78ab/89813592357.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/91984651991.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/nepexuwiwe.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/41463880374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=luxaire+furnace+owners+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000197b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001afce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFCE 10644 bytes
SHA-256: 04a6e93616c03345ca6e201086d00593b5eb4240bf4d00199a9c562a66329d55
font_02_sfnt_off0001c837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C837 19892 bytes
SHA-256: 5134beff7d7fc9d47b71c73db359ef16d0e301b4740e26ae9d60e362d8e253d6