Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9928a7e826a3b09…

MALICIOUS

PDF

83.9 KB Created: 2021-07-02 04:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44639620a8a8cc6411bdf6a3d76f1a61 SHA-1: b45fc40199346f14c8a991667538c08e9c2b11ec SHA-256: b9928a7e826a3b092e1ba537a9b902b5ee054c64025b9fa15d10bc05fb4d0356
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories, suggesting it's designed to host or redirect to malicious payloads. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

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 http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d991fa57ed---71174360923.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/jozozogiko.pdf
    • https://lesura.net/userfiles/file/37368894586.pdf
    • http://formel1vermietung.de/userfiles/file/68481766852.pdf
    • http://driscollandgibson.com/images/edit_images/file/puxonuwudefawaga.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/37469912150.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/4cudsfh9giub4hval0un2qo6ep/voxajalowogomogorapuve.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c9059146---jorideli.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/54281531b775ee60900d3758cb77caff/86591753304.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e89ca61c---38537033512.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607557e15911a---7987568893.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6eccbe44df---18328239387.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/xajoz.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16089e19b75212---87497651711.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160747de0a7125---lezonebugibux.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd6c29e16---nomolaronoxulefizasegurap.pdf
    • http://yangpupark.com/uploadfile/files/38862884223.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8e40a3986---86822475395.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cabc3b78ab---61204224895.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaee3b6740---solab.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aca414ed711---13325480190.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=a+word+that+starts+with+an+e
    • 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_off0000e56a.bin
b06f9dc6a01e43897a9c55d10cc07d8d0ecff84f1770ec1465436949b68a897d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 10368 bytes
font_01_sfnt_off0000fcdc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 16792 bytes
font_02_sfnt_off000114ee.bin
c95fd0bc9eae28cff16830d57cfb1552ccab9f3653e5ee9250e8bbbaae9af189
pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 17584 bytes