Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab241f8b7c227996…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 12:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d9253d5be0518baea385e76c9688add SHA-1: 0200fbc532f6a860540fb521f6cc85b091c0a3e5 SHA-256: ab241f8b7c227996a17d177531123aadef2869ad5444e2a7ddce97f8ef4ed6b1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload storage, characteristic of a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thanaclusterwestgate.leaddeehub.com/userfiles/files/riruzeduzorujekerasevusij.pdf In PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/27452396699.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/fapejapaxukadezekotad.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/pofogogotakerinonikapo.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/28753128555.pdfIn PDF document text
    • http://falerisztika.hu/tmp/xufapew.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/88653247293.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308ab221a81---97249024630.pdfIn PDF document text
    • http://klenderbio.com/upload/files/78553673552.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/xanixafebexoxemaz.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b34b5091aedfbf58e5fb2d31826168f1/81422800954.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/gafikezer.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/49903781638.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/zogegurof.pdfIn PDF document text
    • http://prograsifkalip.com/files/85890309588.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/86186774526.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/44204169664.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613370a861001---50355765395.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/gururupuveninonefopupi.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/genurojajopelakudubodo.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/kosup.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/vepisosajazuzomugelolim.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e988b2eb41---sutozubefol.pdfIn PDF document text
    • http://turnyras.lt/Files/file/55937844716.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/79096593123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=truck+simulator+pro+2+mod+apk+android+1PDF 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_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 17612 bytes
SHA-256: 53759bd58860cfe0df4d19d65244544168d6a69fe006e2fb6fb7b5a8c16a7a52
font_01_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 10868 bytes
SHA-256: 2826a471f905ffaf63eb32e0b97350b38ebb8674c19d8ede847f866283535436