Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc905c0cb6c05b0e…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 14:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b4ecade988fa85ca90c09678e3678638 SHA-1: 2ec0c9afc24db55a54d9b679e587a39123c53985 SHA-256: dc905c0cb6c05b0e2089ab535fe623a0187fd017b003ac9b93a58f1e06785b59
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://adian.eus/files/galeria/files/73763632927.pdf In PDF document text
    • http://1day2night.com/UserFiles/file/59290409100.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/wawezubebisabufefiba.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/vepivexebutuxekugifodi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe347ea970---43259824834.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5sv1jcfni5oibiccm7mtf9q2s2/noxezip.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c320b137f6---42684766335.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/59531479317.pdfIn PDF document text
    • https://slide-bearing.com/d/files/worowasoronevifufogaw.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/cc82eee2712df3c7db828ecc4152b3e1/73365336710.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/lc0r3c9r963u8h4e8h5rg1i0h4/73252847082.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c6d7307e6---razimesemaxenodegalafet.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/maneniduwuzojo.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/biwugopitonubu.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/romepolepirorowevov.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/66004601741.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/pivefeneparejiti.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/60368675640.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862ddd00a03---nenaragaxipovibojaduvir.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/50211036328.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac43061f79c---88925993365.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/kujowusafalukifusosu.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/14292641635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tnpsc+age+problems+in+tamil+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32D 16080 bytes
SHA-256: 6ec0a307146d9be2bdd9dd9a35227856c774c3cce985d3f038f6c9b4f02e256a
font_01_sfnt_off0000c860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 11064 bytes
SHA-256: 42fd346f74e51e3e4e32216af56bd3c15f49b3da3d8579d5cc565baf1e30433e
font_03_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 18876 bytes
SHA-256: 31d261ccc4b596e9c3159cf5a64c64b9a054777a0b48be0f68ab1d1abb7b4b90

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