Malicious PDF — malware analysis report

Static analysis result for SHA-256 8598d8f369429918…

MALICIOUS

PDF

72.1 KB Created: 2021-08-17 20:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec2c568ca314928ad9f9b15870c8981f SHA-1: 836612ee7e58e23e9fdab60c5f268c5d237e41cc SHA-256: 8598d8f3694299186aaa4c133989b9d6119a00886a2c03f74e5a80a097660ad8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8891

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/880e9fa93a46920c31229fb31eac4cbf/96187931851.pdf In PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160824910d64f6---lovutagopilovunu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1d80f6a7---vavubozed.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052621452773499.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01e42f50d---79542351105.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/2404d0a3a35177a9ce91aaba76b4a2ab/16548813238.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e6e908c73---35368252607.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/tasogilu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b198cebb708---dosoresasugel.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/rabavut.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/66257096702.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/xoxenov.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e30d0c7c4ea---80826955300.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/lutavagurojorepabolo.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/58304463938.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/32463655025.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/831831617.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/70521438865.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb03da31d31---18866954868.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dca84a2477d---sedem.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e39140370e17998533d6231103ed90ef/46302169112.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/sukofuvuxukoteneja.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1tt8eolo1sls4o894jc43oiq53/zunegojugegixalixawi.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/rumanowazonixiper.pdfIn PDF document text
    • http://leguido.net/files/99246348016.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/66009337145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=aace+and+eas+lipid+guidelinesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 10452 bytes
SHA-256: b5f6ad60d0dd1fe8e36af6631698c9fbcf084eda3efec100f33c5e014b681f7c
font_02_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 15812 bytes
SHA-256: 09585d65814100f7232e73e6f668f3e6b5f4319302262771aab7500d92d3e5aa

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