Malicious PDF — malware analysis report

Static analysis result for SHA-256 445f7b07937f03b5…

MALICIOUS

PDF

105.2 KB Created: 2021-09-02 01:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b359056757b2b5ce06fb90d3f55f772 SHA-1: ad1ebbaeca09c6398ef615789049126c9a359429 SHA-256: 445f7b07937f03b57c370d7805e154347877780a6ce0d381eb551434d9c39f9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL targets suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/jpunlah3ru6s8dfrdjsq0rpfib/jegojegerujefisazupuje.pdf
    • http://bestbuyfromindia.com/userfiles/file/50068905133.pdf
    • http://lizhechem.com/upload/files/90015879351.pdf
    • http://sartor.ru/upload/files/26366764952.pdf
    • http://au-coeur-du-temps.com/userfiles/file/15182849053.pdf
    • https://bonacorsi.it/file/60164902638.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb51757159---38080777716.pdf
    • https://lwim-ouargla.dz/ar/files/27277831930.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/69c3c4e83b2c42fd8deb792a2b579bf9/51086746864.pdf
    • http://meadescafe.com/userfiles/file/75502596022.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/35a702c59ef9cb1b5df42b2fd6255a7c/levumixisimozer.pdf
    • http://maility.pl/_ADRESuserfiles/file/28489532850.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/fe00b482620ec5d4ab6393c747cdb7a7/setanobeninoviw.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/56360848977.pdf
    • http://akcjonariusz.com/UserFiles/file/64567833860.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/bojiwofurutejufimezenoze.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff4840df87---pemowitipomixebijeji.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gu0tu919uppb49o89q0p5htq00/vilam.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f451016cef---98103148727.pdf
    • http://gfhs1978reunion.com/clients/56625/File/62829629715.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610adb232a5ee---sesedumubavumav.pdf
    • http://isvpro.com/custom/files/jadexekowobejerefujodisu.pdf
    • http://posicert.com/upload_fck/file/2021-8-18/20210818001459173297.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+man+who+built+america+full+episodes+online
    • 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_off000131d0.bin
80c9896e0b1b5114bc359a5af28ee897e396d1c73664edb09f8f451f22570604
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D0 19216 bytes
font_01_sfnt_off000163d0.bin
38dbf0d559c3d2ba555d7fb51c4cdcaf8b59f68d9115ef3434d84d700288199e
pdf-font-stream PDF embedded font (sfnt) at offset 0x163D0 11172 bytes
font_02_sfnt_off00017d8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17D8B 16792 bytes