Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd086c4c2c43dda8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 19:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45e0f5cdf6da84252905e406f749b14c SHA-1: f91a119af97eda0f1725505d0590d12336b9fa3d SHA-256: dd086c4c2c43dda8adfc980a29b194f350587353ef853cdcdd2be03e73316247
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://warungmimpishio2.com/contents/files/gageruwimerijewupuriv.pdf In PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/43988169907.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/kikowuwitepowukosulim.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/tapafirojevajepugovomife.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10052690457.pdfIn PDF document text
    • http://garderoba.sk/images/_file/69892209141.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/17971596456.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/sepaxufakuj.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447e027b2df---todijomidovasenisegani.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109132257161664.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/memudedizorutamobab.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/xifupebovujutiro.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210919_0DC37C752449A86B.pdfIn PDF document text
    • http://rooptex.com/uploads/87317661715.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/bemijowamikigafe.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/sepatuxitalawerixu.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/86882915370.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/6597798228.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b2f8d9354---35410102181.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/68005345806.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/97734171195.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/tapujabewi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613985005f6b6---11671236556.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/68212350870.pdfIn PDF document text
    • http://boxethai38.com/upload/file/fulokub.pdfIn PDF document text
    • http://mastervin.ru/files/file/14600362524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gba+emulator+games+androidPDF 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_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 16988 bytes
SHA-256: 6e4d776041f5c553ecc5e6ed5b30acd48fd9cfb47c197460566ecaae267e2501
font_01_sfnt_off0001082f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 10868 bytes
SHA-256: b9761e53e7df438849721cf13555dc6ab5ba0e04ee6f8d154737127862426ac8