Malicious PDF — malware analysis report

Static analysis result for SHA-256 845fe1f7b746373c…

MALICIOUS

PDF

122.7 KB Created: 2021-07-01 13:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9dc9f826ef8a02933e563d3ae1fe9d1 SHA-1: 1b402606d3b3b3876c8784e363ad40bc55cc0667 SHA-256: 845fe1f7b746373cd209581c7c938125e360cdd37ba094b2d94915e49bec63bc
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier strongly indicated maliciousness, and the link farm behavior suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 5

  • 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://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf8f818e2---zutupotaxofixikibobo.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/88447fad72e47c914ea813aef9a0ca46/koferitaxepajoxibasezal.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/93841231808.pdf
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/jedijetapefi.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/4j94qhca1j6igi4k3p0e60b245/41432031845.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2d91ce9bd9280ccdb2b7a1af6616474d/10732939991.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/77eeb62b53a22ed2369976cbc8891a0c/75666539843.pdf
    • http://libertyquad72.fr/userfiles/file/17798569386.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd3c61369---ladagamozobabozidalir.pdf
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/kimodol.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7fa9180df---82049167920.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5svbdtkg1o8enf3b49th6ls974/derirufeta.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9782dac624---taravilezuratekasadevu.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f047222f20ed424bb8cc3ede7d036f4e/goxadibesukamozewizawazen.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a1b894585---mexixugefemenotodemoj.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be96c41ea6d---dujenigadumoga.pdf
    • http://ozona.pt/wysiwygfiles/file/jipiwaxeza.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/9hn94eomsrmka42m1ge2veim8h/66647430454.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160838d7910db6---weronuvuwimunoponoxezu.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/906a1155e9279c46fbdb10052c44d819/solelupujatikowopizo.pdf
    • http://alliance-vietnam.com/upload/files/koxebetumew.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079b20f30fd7---59933477555.pdf
    • http://cuatro-pr.org/sites/default/files/file/butivurudexi.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091de7519a70---towuzedozujun.pdf
    • http://creptiles.dk/userfiles/file/malupezebapog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=troubled+childhood+meaning
    • 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_off00017c21.bin
6b3e23f4b2c1a5e6618c767c2dcb10239b7f7884d866210c8c031146e839e781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C21 10752 bytes
font_01_sfnt_off00019453.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19453 16792 bytes
font_02_sfnt_off0001ac65.bin
cc27d7d705435729485a23d56fd628b22394aeb17ffee0cd967d48e7e8c71d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC65 19204 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.