Malicious PDF — malware analysis report

Static analysis result for SHA-256 425740aa35c4a8a2…

MALICIOUS

PDF

102.3 KB Created: 2021-07-17 10:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c8cf8aa21fd2c2cfbf5fd9624aaeea3 SHA-1: 7abedd2141616bf4e0e9dbb0da9146cedae4e961 SHA-256: 425740aa35c4a8a2c19bcfae91e3abf748779a5f93455a06197b7191eae641f0
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to potentially malicious or compromised websites via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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.videocopilot.net/assets/public/ckfinder/userfiles/files/rejiwexod.pdf In PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dd18809a7---99805112759.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/19454096279.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/37650549158.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6cb5ee0ba---70569156163.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086580840a24---rezuluminitadegaxof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f591b98e3---16287501264.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823d666b0ce---66147515601.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/fofalelaruvuk.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/fd7b9e8e322e57c6e071837e9a35dc95/98858110907.pdfIn PDF document text
    • https://samudra99.com/contents//files/zozefatulaxixujixaforux.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/24e7c35ee98b821675f6e3305595e406/48374525717.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/69004764918.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/747505d3af9f7f2c9374df1fa9544f43/63212824280.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5b3a8bc7---30986628738.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6907c5187---sotigomerixededunewug.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4871d35bac---totufuxusorog.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/peguxemilutosekoxap.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cbbsahfmej4dvgulrop72qbt83/32343814953.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/2406027220.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/mulasewojegugetata.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/94670593915.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/26878744169.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa67fd76de---52908119801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+much+anticipatedPDF 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_off00012bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000143de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DE 10408 bytes
SHA-256: 15b380f8fdd1703b0db58418cb11086c220390565d82aa78d62fd6df8c4dc08c
font_02_sfnt_off00015b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B38 18056 bytes
SHA-256: 3be2e5206dd7f354ebe765176019f7d741f52b89084395113c28c1ef0d27dbb0