Malicious PDF — malware analysis report

Static analysis result for SHA-256 d856e6490ba7f432…

MALICIOUS

PDF

87.8 KB Created: 2021-07-06 16:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5fd0621aa2c74d2167af69474c1c5b59 SHA-1: 533d113c5abf94308774988b16d26153ede2189f SHA-256: d856e6490ba7f4327b4805ceb27e5e7e65eaf6f778fa1ce90b434b7b29ecd61a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on compromised or disposable domains. This structure is characteristic of a link farm used to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://numen-wow.com/userfiles/cloud//files/35088649936.pdf In PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/44b849bntt9k71699h9judip3j/gadizaxepasigufe.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/46385704453.pdfIn PDF document text
    • http://alptw.com/images/files/gavuwuduxevi.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/runasuwasabipidipekemuku.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///dimagutoxufos.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/76964372576.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608096254acbc---tomowikivube.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/xunetonedevizaravavalaj.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe0e42f354---130713678.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4f814020---zijenodizoditumekax.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcef3cec03---52523144221.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825202db674---38118709891.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/fatewesefil.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/73c8fe6435564808a13cfc72fd1de443/6523919604.pdfIn PDF document text
    • https://chp-travel.ir/data/file/gowolubibedefabized.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/401mub26g253jnq51a2r1oipi5/36023029899.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/oq32vlau9r50sepmg2qvb8tv27/pifidofirizi.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f5e5cdbd968a6d865d217f246b102458/voxevow.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/xegidamizopebasi.pdfIn PDF document text
    • https://chemasan.lu/userfiles/files/12271627734.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/39823019201.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa6488721---xinusokezokivewizag.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/nogivujot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=list+of+foods+that+dehydrate+youPDF 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_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 18164 bytes
SHA-256: cfeb968e2a5ea694ad6ccf333c6f13457a37c3251ab2253985bb1603441369bb
font_01_sfnt_off000121a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B7 10472 bytes
SHA-256: 7e9574f8647deef7d3f38d9d6b4cdaa9be1cb2cad7b49642692016bbd6f48f96

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