Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0ff55177f5aff6…

MALICIOUS

PDF

83.4 KB Created: 2021-06-28 02:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1b3d233107a5354409995c0cc953e4f SHA-1: df1e29c57be72987f46ae8ccee270b6c6c95db20 SHA-256: 4d0ff55177f5aff67387c1fb0381254f5f38ea180df24e02a0f47f67442c09d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://garglob.ru/uplcv?utm_term=hip+extension+at+home
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6e5799b6---xaruxexapunusef.pdf
    • http://alliance-ltd.com/userfiles/50529574035.pdf
    • http://ahkjt.com/upfile/file/16149929961.pdf
    • http://susutour.com/userfile/file/4924408898.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e76802981bdaeef7d7c584d348603c4e/57496164711.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ad077f5da5740d06c4656d09e7f63ee1/mebizadapuw.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2d50b108f999d34f32141cde00f2c253/jixaxurepabeva.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071abd78c7d8---22350388406.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/24f496719e7ce66e6d773518f60f93d8/wofazoxunabonoli.pdf
    • http://thuduchouse.vn/pics/file/48156318170.pdf
    • https://aravlicraft.com/cmsCart//upload/file/rinekarimi.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607881939eb02---zotuxekemaretug.pdf
    • https://tipresentoio.it/images/file/48798993423.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b168d3e7937---81190086234.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/fnvvn4l8squ8r3iuk61bletiro/36765551670.pdf
    • http://baigeleather.com/userfiles/file/gejuligisijomixibiwa.pdf
    • http://alexlunacoach.com/img/editor/file/22283512132.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/77ecm6nok1o557juef4cviebc7/pesusiropox.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/16661d2ab3bc39b0195e18200f062d87/95781145714.pdf
    • http://shinex-auto.com/userfiles/file/84346333965.pdf
    • https://topclassgreenery.nl/images/file/wajagilok.pdf
    • http://logo4you.dk/userfiles/file/16556363681.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/doe9c3gsgq7ijc81gkso5oesk6/vemiravegimazapero.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/db5966ee2cd9386a29e3d429223e0b19/semewepo.pdf
    • http://forumcutuca.com/ckfinder/userfiles/files/60127529365.pdf
    • 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_off0000e5e6.bin
f0e909944b63e03dfde9b0e0594380807aeb447bfa2914d573a43b0816033480
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 16528 bytes
font_01_sfnt_off000110c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 16792 bytes
font_02_sfnt_off000128df.bin
294e2353c207011c2682977a1a6d23f77b2bce77042a05fae7da71a664c34546
pdf-font-stream PDF embedded font (sfnt) at offset 0x128DF 10464 bytes