Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad5c977c735d353…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 03:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c339e0857964ae41a3bc7cffac27043 SHA-1: 4e9f0a4ed05cf6e4f20c122030ff1f3a408b0cfa SHA-256: 0ad5c977c735d35380153dbe1db21c4213d964f1f9d2de86c69894ff05a52bbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://prime-standard.com/piceditor/file/kidorofujubalemitinopa.pdf In PDF document text
    • http://tgroupsrl.com/userfiles/files/rikulalajesi.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/83307015748.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/44290279396.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/temonakanukozu.pdfIn PDF document text
    • http://delifarm.com/images/file/39592889993.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/fesafor.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/2qjdivji9c7c5vk3v8rl1odkt6/23271966407.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/30626051013.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/80741617121.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614175f8457d7---numigexej.pdfIn PDF document text
    • https://cityface.cz/res/file/jiboleladufobanawu.pdfIn PDF document text
    • https://tenderdiary.com/ckfinder/userfiles/files/34997261318.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/7099518640.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bdd972c987b8f1f415aaca04491cfd8c/lokirififepo.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/luguwebu.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/foroba.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89d3ee945---86468549233.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/89537578095.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/4388095415.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/webugajarob.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d837c6aadf057205780d9cca22d4d3d7/20526231591.pdfIn PDF document text
    • http://haphadoor.com/upload/files/famutanex.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/95901815931.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/46038568381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=open+numbers+file+on+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB080 10824 bytes
SHA-256: ebb70530f3970c50bdc4c7cc1f243b4029682686c56d1da989096574d51877ce
font_01_sfnt_off0000c930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 15940 bytes
SHA-256: 7f7c2e1339a04ad844d7859e239dbe0398a51264b05cc45f87d06909d5bbe3d0