Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c29c0098674c41a…

MALICIOUS

PDF

73.7 KB Created: 2021-08-17 19:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abbf2452ea4b4071371f2c636960b0a9 SHA-1: e34df32d70764b46ba7510d630e3b5872dbe6a23 SHA-256: 7c29c0098674c41aad3afd8d6026fb1697cd27b5d98e086a086fd79500ad950f
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. Several URLs point to compromised CMS uploads or disposable hosting, increasing the likelihood of phishing or malware delivery. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=ejercicios+potencias+fracciones+2+eso+pdf
    • https://ludbaegitim.com/calisma2/files/uploads/pojiwusobibite.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/193f7adde9d655fc292fff270fb4c440/15621863926.pdf
    • http://mulherinscampground.com/clients/879992/File/wemafaroxovidapepoluz.pdf
    • http://mini-garden.ru/userfiles/file/javozasamu.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c024e49123---jatipudisut.pdf
    • http://begemot-rus.com/uploadfiles/file/2021052613434373499.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f25d7bc17a5---patowimofatilevilirezumed.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16086ec50a304f---30631977276.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9800960b65---tizufaxi.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160986569402ae---1877979234.pdf
    • http://arohitourandtravels.com/userfiles/file/biriponitutipupan.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/pirazuf.pdf
    • https://fentesmakina.com/paket/upload/files/joderukojidafaxebosimid.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/652loklp3ft58b9vu124tnugvh/31770383324.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160843721bced4---18742540317.pdf
    • https://chornakorn-packing.com/ckfinder/userfiles/files/22717046353.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c160aa5200d---nibasagaluxorep.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a56878d2ac4---7635285249.pdf
    • https://cmflower-kkc.com/ckfinder/userfiles/files/kiwuxoz.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116780a6ac3e---64473690518.pdf
    • http://celesteandtorsten.wedding/images/file/poror.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094488ad6d4f---wezukanokutiputokazazuvi.pdf
    • https://airflow-skateboards.com/upload/file/49602259586.pdf
    • https://hanedantoptan.com/upload/files/sizomerizabupa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd5a.bin
d91dc2089acf6419259cd8e77372cead7583a9a5d7b433ffddad9cbd78162c53
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5A 10800 bytes
font_01_sfnt_off0000d664.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD664 16792 bytes
font_02_sfnt_off0000ee76.bin
838ad081e46ff38ec16cffda9e9b334b5112266e85cdd1ffceaa618ff69da75f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 16360 bytes