Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53a9a5f46b8e2c7…

MALICIOUS

PDF

107.4 KB Created: 2021-07-06 16:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c79901672e77da5c2f612aeaf6efc3f8 SHA-1: 9be6685ad7fb9aa3dd5e6f6f19a68ef3b5f80ca5 SHA-256: a53a9a5f46b8e2c74d845a049c7f1ea5f7aca761c4913f9d6e849c3eb7f47033
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://accesoriosalmayor.com/images/userfiles/file/totegusirakixumajo.pdf In PDF document text
    • https://arvikabc.com/images/uploadedimages/file/34153240699.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/lekugilujamodila.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/seleje.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/jhhubj15vloke1kasa83q0s1b3/tipuwalobowerivawuma.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d67e2ef620eda3e0b99b72fce6fd4421/21617872394.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c10064a0db7---7114516162.pdfIn PDF document text
    • http://talleresjpg.es/img/file/85987454940.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/57993956480.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/82143797292.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1c5d98e194---witomulivixaroga.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/98ac50f9de3762f677140d871c00d122/nenemidomejanedolomore.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7fe36be40---vusuwemeg.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/zasaxakudaxizib.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/8cabecdfb36080f539b5c4dd0df1b01c/93777918441.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/kiwatijorudaku.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/cfibt9tnajop27gmiokq0athck/99404261396.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/86138521959.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2dc3268423973a8c32865746b1cab4be/tiwetapanewodenimixes.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/j5cl43hu4hucblrl7kdq9jja41/12361121647.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/c2b4a567b4d64e56826f750381519a88/baderuzunusabajumevabux.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d65dbc12e7---gegokimidutiwaxuta.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/95510281712.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/popaju.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/csehmvsulh4lgm3bmecq9178op/vogagoninoselezupisofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=60+ml+equals+how+many+tablespoonsPDF 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_off0001390b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390B 19772 bytes
SHA-256: 4e496866857dd47e8a3af418ee9690a7525ac786b1a12ebd7830eee816a98224
font_01_sfnt_off00016ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CCF 11104 bytes
SHA-256: ebc60111f3086ff9fad0b84d4add759621a4918c7a3592df0b4caf016c40d791
font_02_sfnt_off00018666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1