Malicious PDF — malware analysis report

Static analysis result for SHA-256 148f1e3bc7ebd850…

MALICIOUS

PDF

79.1 KB Created: 2021-08-28 03:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 640b42bbd92a4e11b1371e27ce23a60d SHA-1: 83fb6dda159ce351d98e807e46b9a823f923569e SHA-256: 148f1e3bc7ebd85036e3025e3976b0ad6a73aec86a4ea940df185dba947f24fb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous PDFs hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure indicate an effort to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cupta.org/userfiles/files/20210706020557.pdf In PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/pevogunop.pdfIn PDF document text
    • https://virker-ikke.dk/files/66003273807.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/jatojedoxirijasedafimof.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8a0f25c91---sajukafizurebip.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/27706401872.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/23731421350.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d1c71c66aa---17683778349.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/88912331962.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/39165810233.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/nibinabazefus.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c602a5acb---bodilozubegenagewuz.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/37208274785.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/1htsb80l75lggvu4ppb6d5707a/wenobusulamixaz.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/41043826070.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/46873268819.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/towetuxi.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/58407615209.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0af6ce8d---wuremujobatiwanamuvabi.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/rodoganabi.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/witogunonuniromaberulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=compelling+definition+in+spanishPDF 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_off0000c408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC408 10876 bytes
SHA-256: 8bbd5b0d8709e30e9c6a69d1d23c52f7ab4785970b0b689dc5eaa7f11ac94f10
font_01_sfnt_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 22068 bytes
SHA-256: db6e3551b17e6264d1683b6ac633d7709eafc8efa8e15140fbc9b622626eb1bc
font_02_sfnt_off000116a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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