Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae222edc9e520a48…

MALICIOUS

PDF

92.3 KB Created: 2021-08-17 16:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1969ee1a28115df643ba6f64faf547f1 SHA-1: 60ca7ac9fcd13fa18343a9a944b65d626b8f0db2 SHA-256: ae222edc9e520a48a1616891a8c68dc9e05ddd10322d3e79dc01bf3a2e686219
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://improntediteatro.it/userfiles/files/pozimak.pdf In PDF document text
    • https://menu2uplus.com/images/file/9772281160.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/87023035791.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/fumosewokowubefu.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c03bc3e4270---bozuwodaluwivoguvuxuru.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/rusewaluk.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c129b7f278e---57824166687.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/nidutowodoxugimat.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/97477358835.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/fixevubewog.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815c518fdf7---terevedigepoguxet.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/ravuvusujugamazuwor.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/62084959872.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/dafonezevorovevepapozadaz.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/e309h7jvi6sh2fck3n0sgvnt51/79422527008.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/490075075a251294eef2de854e7dae33/71935433460.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e4b529ace---59469232107.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/tofabilixel.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2089a0320---17968329255.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5cb2e0da---34245943564.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/3kd709dg35e7l1peencbdalk5i/78547198381.pdfIn PDF document text
    • http://vhshf.de/File/53758356377.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210808/file/16284013632447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=noun+phrases+worksheet+grade+4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 10868 bytes
SHA-256: 80790b31832285c53d94da17640de54028e272d94952e5f156be95ad71aac5e3
font_01_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 16308 bytes
SHA-256: 6dc6f3641788db435fc2a49b9e4e07c9f8ce8817337daf1b42001951877eebe5
font_02_sfnt_off00011be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 17796 bytes
SHA-256: e743983bd84b3749c0b4d579827240925ec4e87f61ba72f4308bb8b6551d85fb
font_03_sfnt_off00014af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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