Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7263f664322c03…

MALICIOUS

PDF

125.3 KB Created: 2021-06-26 02:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48ec61d20bff23986e43e4931b0f48b4 SHA-1: 136529e4cff2408fc39787845e736499ccd6e4de SHA-256: 6a7263f664322c03b20fe4ba74aaa1b138f06b3db0925f3cc5bb2577f002b527
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is also detected by ClamAV as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or phishing attempts, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d23cf645fba6f82f68e5cba4e368ee79/notexokopozipuvemuba.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9c7376da0---lefiduxuluz.pdf
    • http://bud-drog.pl/userfiles/file/wadaxopesifakib.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1798c202---wotewaxijebimenevakir.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4095606b23562663b0ee69afcd54b45e/faferabeg.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/1eb7fa7643b55f2f119c575b06cd31b5/jerewafilovomufeve.pdf
    • https://jambukuning.com/contents//files/midexanefa.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079ed19c940c---zimovadipi.pdf
    • http://arch-teh.com/pic/userfile/lirodakugizetabuwovep.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16212723237227.pdf
    • http://dok-vo.ru/userfiles/file/24536091787.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/c1j9fphnf1ppjvh7i6vrdv631m/29318332713.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607647b263a24---88294938894.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebf3c11e45---62599972632.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/afe588699aa596ad3a8919ca6894934c/55897288996.pdf
    • http://stavebnevyrobky.sk/www/upload/files/84593648826.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160722b2220369---pojebojowalelenanoziku.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078581b5ca20---32819115864.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01f0328a93---kuvokikokogoxobowi.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607780c004cb3---nixabewurirazem.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/9c1ec633adfcfb42cc4d242a28cc9a95/5762574806.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=you+are+so+annoying
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016dcb.bin
977a550a8757d177f2bbb870b19a60e9f4ecdbe7fefe7b70e5ca0b89a8a85b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DCB 2396 bytes
font_01_sfnt_off00017846.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17846 16792 bytes
font_02_sfnt_off0001905d.bin
bd7a3c681384b5879d859fa6925f009219029d500da158db9be5e1e5f50b739a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1905D 10336 bytes
font_03_sfnt_off0001a7d5.bin
264a89c3a149a0113e5d23321a5231166dc8780693c77d722a4de04f4bd7e762		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7D5 24988 bytes

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