Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14cf28aeea8e3e0…

MALICIOUS

PDF

85.8 KB Created: 2021-07-09 07:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4752a09e1d249c757cdbe6254b47af4 SHA-1: 0ef601fd6b90d68bfa10310a58f7c314eb9a04c2 SHA-256: c14cf28aeea8e3e0502134474c9938d99bb2a369fdc98f475d4800c8f343da43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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://garglob.ru/uplcv?utm_term=apply+the+pythagorean+theorem+practice+worksheet+answers
    • http://amandamaitland.com/images/file/jubenabejubobivujituf.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8cc784b6f---72917637105.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f292f99ba9---67279767799.pdf
    • https://veljun-ldm.hr/files/wetozajiraro.pdf
    • http://esistore.de/userfiles/file/89855576366.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/t44gqguu7o77ailpplbsmj3u81/biduzilevapuzot.pdf
    • https://n-v-v.dk/userfiles/file/tanobopolafewowupujex.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/f1prkuadoeqesh4gr1f915k122/11264750646.pdf
    • http://ghioroiu.ro/sites/default/files/file/mabesiwexinudebotunasipam.pdf
    • http://pokewaveanaheim.com/uploads/files/34173151121.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7c3d65c9c---66688064287.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d5caccd8f2e---55730229980.pdf
    • http://ahcxdq.com/uploads/file/280836256113.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae90517410---wumilobovero.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e673d0bee6---74395201507.pdf
    • http://abwlanham.com/uploads/files/nevakuxufiwifesi.pdf
    • https://augsburger-dartliga.de/uploads/file/58269424048.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ae9a353e1---xarisikutulapeporiduvux.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900864e79cb---pevoselugas.pdf
    • https://m-astar.com/UserFiles/files/52097898809.pdf
    • https://jotekonybakterium.hu/userfiles/files/8284523938.pdf
    • http://emirates-offshore.com/uploads/image/file/66363701381.pdf
    • http://antifftech.com/uploadfile/file///2021050522554323.pdf
    • http://asiavent.com/UserFiles/file///lerejufunuwagiw.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_off0000ea12.bin
325d59c3e93e54dd2f222be87e1e13a039dec9dbd864b99dd739f87f0a3bfd58
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 11096 bytes
font_01_sfnt_off000103e1.bin
c9f96ba301e09acd9ffcbcdfa15c69764dc9639dad41de827c78d3dfd876ea2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 17160 bytes
font_02_sfnt_off00013153.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13153 16792 bytes