Malicious PDF — malware analysis report

Static analysis result for SHA-256 96801a6829687b7d…

MALICIOUS

PDF

84.4 KB Created: 2021-08-20 20:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc70d717c61d15f1e11ece400f3127b9 SHA-1: 5eb722451b70ffcd4c874ff0b4de2b572ec3a179 SHA-256: 96801a6829687b7dfd6af6fe22f9fb9e7e0335f94d49d5cdcf9e86698e52bb8f
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 functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous links on disposable hosting suggests an attempt to obscure the true destination or purpose of the document, likely for phishing or SEO abuse.

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 http://caramelitos.sk/files/3396452706.pdf
    • http://chnli.tw/CKEdit/upload/files/38513536155.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/pfpl1hpfh0k3tl418ri9ehntv1/napokatujesikumezugiw.pdf
    • https://hospvetcentral.pt/site/upload/file/zezusoxalukifi.pdf
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/65077510423.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/fc2911cdcad3f3d3ae2af3a267458235/narutazafererupukepipe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610faa9f1aa5c---wiripubozo.pdf
    • https://amatnieks.lv/pictures/image/80672842415.pdf
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/fedotu.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160752d03c7b04---xabejujobelirepebadupaxov.pdf
    • https://mmagame.com/userfiles/file/82831379409.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b027adcb11038d0f1aceab518e5caa97/97621562543.pdf
    • http://www.niziointerior.pl/upload/file/zegejarasipupulux.pdf
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/25848950204.pdf
    • http://anandamsanyal.com/userfiles/file/gidapudeweferugezo.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/bejkfcojmqhtag7vf6jcjc85oa/wafesulopofo.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a58e0521aa210b72703a4421f98c9c79/difozunigate.pdf
    • http://0965818789.com/CKEdit/upload/files/xogib.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c5088dae---83567105765.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/94425055845.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7goqiqjnts8adhdgaubrusm6fk/tegomijatebol.pdf
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/1332095990.pdf
    • http://idealhca.com/admin/images/file/duzaguzedoxifozinemiz.pdf
    • http://harrisonfamilyreunion.org/clients/868801/File/lutopijiripu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+much+is+55+inch+lg+tv
    • 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_off0000e566.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 16792 bytes
font_01_sfnt_off0000fd78.bin
6a99663fdaa70aab1aa1fd3ab342a94d13887be71d3f02e95d1420f0f4207618
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 17868 bytes
font_02_sfnt_off00012bc4.bin
597f9f17497a4a5d41ba314ea42846571a24a7110e4d107f80e2e673c773c6fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC4 10660 bytes