Malicious PDF — malware analysis report

Static analysis result for SHA-256 43afc44bd7928bdf…

MALICIOUS

PDF

76.4 KB Created: 2021-09-10 12:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f63e35cf4a52eb3f93943b04b02ba2f3 SHA-1: 369729a83cff690953457da65b28c408cc609953 SHA-256: 43afc44bd7928bdf062f4b432f9ec439f978faf6766ada911128793092c1eaf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate it functions as a link farm, directing users to various external websites, many of which are hosted on compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://allytemp.ru/uplcv?utm_term=xos+launcher+2017 PDF link annotation
    • http://erimti.com/userfiles/file/kawizegejireguronumeju.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/450303_tuwejixof.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/84113388087.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/napalijijamone.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/p6hu8g0u3s5llh3tsmlhjpsk6r/dokodegeloxefaxudezitazam.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/2970871778.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/51534296672.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/sabubagisajizovalup.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ba55ba48afeb7afcea9bd612c6be8fc4/favujelisobusufejejuj.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/ximab.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a25602fecc---dalanagaxaril.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_210512.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/kagubosuvelibufalonapur.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/hrf40h267h78j0p906443elbd9/kilapabuseg.pdfIn PDF document text
    • http://vladekoservis.ru/files/gaporakuw.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///bisibim.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da123b8d8---67009062929.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/80063844956.pdfIn PDF document text
    • http://skupka23.ru/upload/m/wapadelamunamifitinem.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/dirigigitofomasuwa.pdfIn PDF document text
    • http://salkim.com/userfiles/file/zupebetuwegivoxa.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/zimizupi.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DD 10588 bytes
SHA-256: 0309b74cf40f9946f6fa17717839943d1fe7aea35b8aadc1865b813684bf1057
font_01_sfnt_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 17524 bytes
SHA-256: 685ba95fd709e0243e0ddb38d1064e901502fa5b2f5886054d6a900a2c6c8918
font_02_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1