Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1814dbddbf221c…

MALICIOUS

PDF

93.5 KB Created: 2021-07-04 22:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dd134f6ab0d0d0d78bcf6fdcc66803b6 SHA-1: d4e0cbd36016cea75c5a11330a4b0dded85e26a9 SHA-256: 9b1814dbddbf221cb8ab6e08d1347d38f9d8f7888c17bd1ac43d9b31f6c94d0e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to trick users into downloading software. The presence of a Google feedproxy URL with a 'download adobe after effects cc 2014 full crack' UTM parameter further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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://bafiti.com/sklep/userfiles/file/mezutusasaberivus.pdf In PDF document text
    • https://zlato-eu.sk/upload/files/dubiwozoxixeremujebofinev.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/015a505730bfc4608b552ca70a9b47b5/puvakoguna.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92a3f21b96---67043458402.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/14372374691.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07027a636---28276389332.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2c5cbc038---nuwakitu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087fcd4bf0d9---samaso.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/15812942087.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/fukijejesofet.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/7agrmredlcmqm1m1sq9h13jvr7/waronumexapopinemipavozo.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/24709807725.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a77598a3868e1db1862230941086757f/8700453479.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/or6t00nhld8ubv8b09q7693emr/tipasulagogefili.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/sinomarubutidoguku.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087816acf102---20331299356.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/4813146259.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3b4fb837f08284e93556964d6d1965c1/tixopolopibenirajerifawol.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/62eca30421987f3a4bf3e457fc5f9051/kujotanu.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210627_FDC29F7B243C69FD.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/13046284155.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608853e48a320---69975186494.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/a1ead45e4859f08deda724bf6d49cbc6/82260181203.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/gerakedubenomufubivazuwa.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/76657121448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+adobe+after+effects+cc+2014+full+crackPDF 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_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C46 17968 bytes
SHA-256: f65c1829b445ae0bffeee3da1f2d7236b1e67a56a074c8aeb2cb44ea83fa1fb7
font_02_sfnt_off00014bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD0 11168 bytes
SHA-256: 9f7446dc97467a54a13919c902e40de97d046bea66df24d28968696b48c4ea0b