Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e770d9deb99504…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 23:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e3147c18069f9e6b6ef3761110c5249 SHA-1: 96ba70b5d639a87d220579705782beb9cf7debab SHA-256: 84e770d9deb9950414944cea9d8484e52bd5368ebca0992f70967faf64cd90d9
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting sites, forming a link farm likely intended to redirect users to malicious content. The PDF's structure and the presence of external URIs suggest it's designed to lure users to external sites, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=l%27ascenseur+social+est+en+panne+j%27ai+pris+l%27escalier+pdf PDF link annotation
    • http://cichanski.com/Upload/file/16171683524.pdfIn PDF document text
    • http://amandamaitland.com/images/file/61480052477.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6953d8ec5---nolidukupupaxetegoz.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5709cc881---motatujerimawixopep.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/12872592979.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/44718570624.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/49150340536.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/fifixetobenebowajebux.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/91912347329.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/warogo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/23c64f0d729d255e6896a2c780c8118c/loditoganibagepenig.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2afb35b2b---93537812470.pdfPDF link annotation
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c7909aef3d6---xoramujexabaxabigivomoge.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/10544495947.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/8688479310.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/vuvutuveladule.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/83409168979.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/30206250055.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb3cc05937---29858874193.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ecf162446---67796675331.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7c481051---41612571659.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098151aef9f9---13505067586.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/volonogolakulixod.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/9d9d1d62d6ae35e383dd51bd9298333e/32150825639.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_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 10832 bytes
SHA-256: 2f540a1d5a50ae01bf8e47dc59f36588c7f04afd0a498873132fbc832cbd228b
font_02_sfnt_off00010bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 20252 bytes
SHA-256: 599f2e8c621e178684bb6338d5ac29ac1cd6e2c224d7f1e374cf483cc46dd49c

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