Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f31d7d20f28f08f…

MALICIOUS

PDF

88.5 KB Created: 2021-06-27 05:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 286900655add0cb4827fb4f805860038 SHA-1: 1fc5948651e81b08015fb54de168233997ca1f35 SHA-256: 5f31d7d20f28f08f53bdfb749719f902a30eba8190484ae4cb63ae6e98c37eae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous PDF files hosted on various domains, some of which are identified as compromised CMS uploads. This suggests an attempt to distribute malicious content or phish users through a series of indirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://paperland.bg/uploads/file/ligubejarenajafukaku.pdf In PDF document text
    • https://mamo-tato.ro/userfiles/file/reladaduzasewekikiv.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/gogotavovinotez.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/883de780bbb4554773149ec8fb694f8b/zopusedenaxazovegowig.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/wanaxeredoluwejegaroxig.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/5746290311.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/tozesuvazarisuzaresuvunig.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/24849174406.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29024f4076---29391181566.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ced0b6ca24---xiveda.pdfIn PDF document text
    • https://blokhol.com/upload/files/88100774855.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/19150032972.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/41df3a26f9ff1b81419855d4777455d5/93066811932.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/df91cb463bd989c39657fd5380dd5dbc/48427747944.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/96164367228.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/9441849130.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/puxagisarunuwirurifewusox.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f877d3a1---33167984629.pdfIn PDF document text
    • http://cy2hand.com/userfiles/79709503060.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fe225b9e85a269fd93a9c186e620d428/92383274177.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/irk4k7ftg1pvdh5i2dj67j08oe/botaru.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f860a322c3---4744018162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+subway+surfers+mod+apk+android+1+comPDF 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_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 29204 bytes
SHA-256: ff6f57e1dc67a7a1bd8604b035ebaff9c03d0e18a1e14cbb7ab2757caee5ac22
font_01_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 11268 bytes
SHA-256: f25ea450ff10ebe87a2c14a22c5d51ae1f994327a2cbebd6569024fc71b6059e
font_02_sfnt_off00013cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.