Malicious PDF — malware analysis report

Static analysis result for SHA-256 970e945b7eac2b26…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 01:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47188441cf11713dc0a71fb4ec17ab5a SHA-1: 8ec19fa379c3c11f44438eb9335fbf5e4c680ded SHA-256: 970e945b7eac2b26e9d01acb7eac169447f039ba8e8de45b6870c6e6aec1d2e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely to deliver a secondary payload or conduct phishing. The embedded URLs and the heuristic firings strongly suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=exploring+black+holes+introduction+to+general+relativity+pdf+download PDF link annotation
    • https://vieclamxaydung24h.com/upload/files/gokinapiluvudaberodinese.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/m3a6dcb8pgvgprf8ec6tpc2d5d/ladiw.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/waresojujevavezab.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/85298503511.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/04239422e44f5df4a0b87969cc50bdbc/vapesuforusoxoredunuj.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094409c3b98b---gilobovepuzokimozumiwokev.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e5ea7ac9dc205d13a24e5ed9f55a4c32/96576227329.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/mqqnerisiimbsqdbghtpidjui8/33479701907.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87760bc308---tevaxarowidebegogoro.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c965218aba---2246473580.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/221811332463.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/rifijonutam.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/38529113548.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8ca2352bb5f0038af5cf05dd5c1e809d/21100799197.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/60988399868.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/ziwedobasutemimesag.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/r3k3htm7ghnij1ua1b1rp1u3gq/fuvatosazuseka.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/83190902356.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7e89f360---58243911434.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/84111045945.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec0c31d3d---jokulisiraxaze.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16084085d4aaed---sosugu.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/5fi1hfct3q376orke32elksvtp/wizovatawadibon.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/21535583817.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/fuzuvaketusipopijigoro.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/42366951945.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_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 11580 bytes
SHA-256: a056b4e190613b7270b537c0b35b00aed97e4c8c00973f92d135b904389af981
font_02_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 19024 bytes
SHA-256: 15a4aff360f8a7ae5224c9c462a5e703a149b8284c4211b586fec416ce91bb7f

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