Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b5c4b44454cfdd…

MALICIOUS

PDF

74.6 KB Created: 2021-10-07 21:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 09bd28e735c7c8fbb1d61b1b289dbad0 SHA-1: d85f89ece4de19c0dc32e620805f1073d7595fe4 SHA-256: b7b5c4b44454cfddbaed3670f5f740abf1237dd988f59f0969977f7769471692
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous links, including one pointing to a compromised WordPress upload storage, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/265087592.pdf In PDF document text
    • http://freewest.at/wusewufudujozoni.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/tilekovifowezemi.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/muxukarixidafe.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b75baaf47c---7769723387.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f624251881b810adf26d3ef3b7d0abe8/60255682023.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/nipakasipujevifolurelajen.pdfIn PDF document text
    • http://daliangluyinpeng.com/userfiles/file/sunesa.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/33252068681.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/zabosakuzumotil.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/79747868096.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/1696870450.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/zokadexukotukafabitafu.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/29615113668.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/57130831754.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ag5lf078dphheapl4v73d563n5/53459408978.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/riruk.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/luvadutowa.pdfIn PDF document text
    • https://kristinanamaste.eu/files/tatojaropeluxujipuwuv.pdfIn PDF document text
    • http://labemweller.medianet-shop.de/userfiles/editor_files/file/7553523872.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/gurinajebaduko.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/dinuniwoxewol.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/tonetagesebuz.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615e9b29eb028---81592321938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=orcein+stain+protocolPDF 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_off0000bee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 10392 bytes
SHA-256: ebe85a965f22bb2ea479b53e70ed025d9ba173fcdbb4dc8eccfa2a3d048beb9f
font_02_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 18436 bytes
SHA-256: e5b7b34803dea71281106903d76282dd048ec13f83960546e1c1b3e2a936835b