Malicious PDF — malware analysis report

Static analysis result for SHA-256 d316fd606825cc2b…

MALICIOUS

PDF

87.5 KB Created: 2021-09-12 04:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ce0d89903332974ab7546456b7ed1e1 SHA-1: bda410a452d01198ffd8b6db60178425cf350581 SHA-256: d316fd606825cc2b83f98ca3ca1485aadaf7828d4a66e080fdc341201f21995b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are identified as compromised CMS uploads or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.naraihillgolf.com/admin/userfiles/file/wagubinuzowidagem.pdf In PDF document text
    • http://euskararenginkana.eus/files/galeria/files/76347066618.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/75400327595.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/xutimorixekirinamozepap.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/24514819243.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130f5583511f---64177574094.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/22777606579.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/vogetinubanuzonig.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/77236747659.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613172e966fc7---kilidapux.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a5e23762192a3109699ec8766fe47208/51829362214.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zetukumunavisozexusiz.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///33653646137.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/9610310025.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/dilixev.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/pebefagipixobuk.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/83763900541.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/52483474836.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/wobowivininitilag.pdfIn PDF document text
    • https://vleek.com/uploads/files/3863069165.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/91151808190.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/16810173831.pdfIn PDF document text
    • http://www.77ice.com/upload/files/pikakexofaxa.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/kagofamaduto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=harvest+moon+back+to+nature+epsxe+cheat+codes+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 23436 bytes
SHA-256: 462f0265030b04c4f3a0f4729b9689eb160ed715a64cd1969ff37afde195088f
font_01_sfnt_off000112ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC7 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off00013352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 11224 bytes
SHA-256: fefd81c95dc0483dd4db6afe6545d9f79015e0c5f3932ac0c97013ad858165aa