Malicious PDF — malware analysis report

Static analysis result for SHA-256 076decf13493f73b…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 23:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e5c34c845a4191fbdc182113a089b16 SHA-1: b12ecc75a14bbabcea0845a860e96ba89d99f103 SHA-256: 076decf13493f73b7ad159afebaba5a590688bd59b30be69c6674d4ea8ad031c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/qk1vcnd43th7adem4ho8k7s2or/sabaf.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff10d6ed9---55592110319.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/18i785oin0qul9db3k4gslevk4/99666558210.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/vixibuxisejezewomitivun.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/setonilogepavovivax.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/bivowivelewebunepokid.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/gekotevudode.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/sebipagafopezu.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/22046136635.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/84786071578.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/sevemixexolemifivowedum.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/rojulikefaresuriparodijop.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/49162292808.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/2nl8bqmdo9ds997uh1pud70dv7/debomazuwugex.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/35a351a697cb6c43d5e90a1dbe3b7a1f/durumerejefonolinufut.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606da645ca0cd---26637812863.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/fesijosu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160721ec66bae1---kagopewelotugafape.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aebea565b5---firogonov.pdfIn PDF document text
    • http://dzbnf.com/upload/file///11476648781.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/87866307494.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/jizuriwumevamixezidavibe.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/zejebanokuzisumuxubuw.pdfIn PDF document text
    • http://webursitet.org/Files/file/napizuxexefidatokomokod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mobile+pdf+file+kaise+banayePDF 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_off0000b8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E0 19284 bytes
SHA-256: ec0aec6f61fa9335a7f4d6a228fffcf38bcbe8b50ddf87444cceefb101c33419
font_01_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 10632 bytes
SHA-256: 68351f1d5d74770bd425816aaefd4956201d412f6cd6c1b4e73d2eab217143da
font_02_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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