Malicious PDF — malware analysis report

Static analysis result for SHA-256 5522d938a76affcc…

MALICIOUS

PDF

85.6 KB Created: 2021-09-13 19:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e436b249ceac533896996da3979c119 SHA-1: d0489892fba13e285d32ae7c04a20882edacfe33 SHA-256: 5522d938a76affcc46efa9bc7408db9dd1a5134da7b4cb7586729bf253552587
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

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 http://bulmarconsult.com/files/zafojexegepavusifi.pdf In PDF document text
    • http://sdes.in/uploads/gobubizusegapimim.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/vibudorerupitubu.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/sunuzusakemaf.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/13981692248.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/93229470234.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/52916609373.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/sipikilibeki.pdfIn PDF document text
    • https://semut73.com/contents/files/nezekusanekuvanezufowozi.pdfIn PDF document text
    • https://cape-electronics.com/media/file/25989841982.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/71f3b5b3eabe9ff237e6e90c1dad5f49/10177871074.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/80305097079.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/42676695890.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/40265001399.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/fazutokax.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c7193b01---nafevujagofilaneber.pdfIn PDF document text
    • http://gibisch.biz/files/files/xivuwibuzokizodozaku.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e95c18efec---vedumolipipa.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/xedekosanoguj.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/64536947061.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/4912085403.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/biwudititevorawewanixe.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/bimalalerarogutureter.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/10202160794.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210912125640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=latest+games+2020+for+androidPDF 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_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 10848 bytes
SHA-256: b44a08f9c45288adc3b1d2c769b60d5a363780ccced830abe9a2c945f55eeae8
font_01_sfnt_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 17776 bytes
SHA-256: 5d2f185565300f10a14530f3b2381409cbbdd53ae0c9270237555cb2b31693c6
font_02_sfnt_off00013089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1