Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7289760037a0ae…

MALICIOUS

PDF

85.0 KB Created: 2021-09-12 08:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b61a5dbfd14863aeca0891dbbde2bbab SHA-1: 5e04ed03527eb80b747d44a7e5a72078c9f202cd SHA-256: 1e7289760037a0aede891f0288e294f9b61e00e9be14276c2266ef4eb12a8dec
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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 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 https://medvor.ru/uplcv?utm_term=xamarin+android+get+internal+storage+path PDF link annotation
    • https://fnb-concepts.com/images/uploads/files/bixekotirifafin.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/51123886629.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/vazuvitovutezejipexixol.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/melozasaredozami.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/10247960787.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/mugazitinitewo.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/sibivetezugatixuvowave.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/burelipig.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/44552583648.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/2b4494e44c2ddb28a80a9881f98446a6/98637059508.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/labudutitemura.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210906020810_923528957.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109090410408426.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/darolatuwotalukure.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/74248274762.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/56487228933.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7df7d88b353fd463dcb30dd61fcebe5b/88007882621.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/fidudegofomikesulonut.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/nelodigakid.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161385193494ae---8289248070.pdfIn PDF document text
    • http://xycrusher.com/d/files/dosituvulilesawef.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/neruv.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/23126033699.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/43653341824.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/nufofiverelavepovixuvi.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/kegotodom.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_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 19524 bytes
SHA-256: 5a58d3cf7fcec33aae7c9fd335b3ac86d286212a5c21befd17957357dc9e9d9b
font_01_sfnt_off0001157e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 10844 bytes
SHA-256: d2c62f45c05fb317c101b361fead094ac0b96b1e39008a1487345aa83163a5b7

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