Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f22f5ad8606e7b5…

MALICIOUS

PDF

97.5 KB Created: 2021-06-25 19:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0367aa3d1cc31cc6bb5191fc3fab3532 SHA-1: c5062c6dcc38fbe195008fd4713d1e20cdabe08f SHA-256: 6f22f5ad8606e7b5b66448ea4957eac3e97c37501a6ff6ccf0993e67c7d8d300
156 Risk Score

Malware Insights

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

This PDF file was identified 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 CMS uploads and disposable hosting, likely to distribute phishing content or malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c9bc486a---nunidukuzemizekopukipeve.pdf In PDF document text
    • http://aftckwt.com/uploads/file/kaviba.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc27211b48---63875409798.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/o4q5krugaje8r9sjlum2ojuljc/42770680011.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/11692458595.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9eb885c0---kefuxatapamomitabofagu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d455c17e4a---85077498599.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/josavozaferidumedarab.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/61941444835.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab4d1a0c1---87971315131.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/64915137408.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c999d4a6d36df93cff28f53de9371eb7/fagatupefinupufubajinirop.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/93152031633.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/96051034526.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f20cddf2---27472892488.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/fajaxigujutazanurigebave.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094226c48073---devawunepotomasoxis.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/37795814112.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/zutuzowipu.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/pegopomanedafam.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/zazegowotawepuxufe.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/45973460252.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/5ced1e69fc11c371074703ca30e64a20/valudosewakiniridi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ps0aiigv1rff1946jne216m7t1/nakamak.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/16484708102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+let%27s+go+lugia+gba+download+pt+brPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 11188 bytes
SHA-256: d352bef27da5d993da9641d9403c14744726d68cae978b563ec3c97f410d24ab
font_01_sfnt_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00012ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000142e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E5 20040 bytes
SHA-256: 3e90af89c2e8e4ed6f18aaf3a1ad8b3ebb00cb3b726ab4d7fa2aa85406f56116