Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb18e3dc0ff189f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-20 17:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a33514216ecca85700fb7698dd0184cf SHA-1: 0b35a5f0048fc316e189e40715d187c65844d5ab SHA-256: fdb18e3dc0ff189f737dbebdf365bf1132bea1934966067ec7ef7c4cd1c248e0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-only design and a click-outward action. Multiple heuristics indicate it functions as a link farm, pointing to various compromised CMS upload directories and disposable hosting. Although no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://fiscconsulting.com/userfiles/file/bilemididopuku.pdf In PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/gtl0ntsun0bvfeagnu24v2glm5/mevokezaruwitorotatin.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/pidudop.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/60356288903.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161381cf4019fa---xulakafubabuwewa.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/43639242408.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/12999751138.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/lenigulafoji.pdfIn PDF document text
    • http://donghotam.com/luutru/files/84501805282.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/jifodolomononip.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/97421112747.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161321a5e97074---sakisewovatoxe.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/79196046193.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/pavatukomikusezowu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b9ec9a240---biwulezojamiretu.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/kidatexida.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/30208194885.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/mugulovasix.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136abda9c1f4---lilumozelipu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135226a3acfe---65153019905.pdfIn PDF document text
    • https://arerp.kr/data/file///74484379339.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/70553320827.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/15931671786.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6da649bf9---wimevobim.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/nubasumuwazepozuxoli.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/sedefisekogufunub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=intro+maker+mod+apk+without+watermarkPDF 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_off0000b596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB596 10672 bytes
SHA-256: 19cba46b6e314c6ae256862709ea2d3ae1014b5913f8cb84ff397f96d8a4c74d
font_01_sfnt_off0000cddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDC 14168 bytes
SHA-256: e4bfe9a55848589f567f5a8deec6efd2079c78c0da5a623bb878fc7df5cc654b
font_02_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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