Malicious PDF — malware analysis report

Static analysis result for SHA-256 0983f6e6c8f96ea0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 10:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e23d361682b65ae6fc71fd6abfa890c2 SHA-1: 44c6b2fd8626fff40823e6fad9bd18f1469974e5 SHA-256: 0983f6e6c8f96ea0d03405dc9321f6b3928f3019678a8e4495bfe650bec58eb6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content.

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://madveras.com/ckfinder/userfiles/files/jetifidejipunumi.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/ramizapagirimizep.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/jigirarukamozekoxamusisu.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/18117667958.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908c0e06519---20791451664.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0ea6d8949---vujafotoxazipekowasirune.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/2bc7bfdbee3dc0a0427da65c1127ab48/mosuvexasezoj.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/jifemi.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/tarazinafix.pdfIn PDF document text
    • https://peterdegendt.be/file/46929872354.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/gejikupupakejagojumisag.pdfIn PDF document text
    • http://meskerjager.nl/media/files/58233379005.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/77e3fka2mv0uii5s1jttu66p9q/84970464338.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/50401143124.pdfIn PDF document text
    • http://chieucoingason.vn/files/43366271658.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/945d5641dff84e247e6c1204c1825176/weledemozi.pdfIn PDF document text
    • https://buyafranchise.org/files/files/95830681955.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9bbdbc000aa5992035983b4ebcb1b291/60128608840.pdfIn PDF document text
    • https://landi-bg.com/images/file/38657806497.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/didomebodemunenotugi.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/muruvolisarapodiruw.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/zegakijoluvazujowuzobij.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/wefajaxozopifibiguj.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/22277264176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pelvic+floor+muscles+exercises+pdfPDF 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_off0000e67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 17152 bytes
SHA-256: e7e7eadfbe05b9eb3c7a8ddb087d8d3fdd200c386edb69581b75e0e571863b9a
font_02_sfnt_off00012b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B11 10684 bytes
SHA-256: a710e92de716ba1df805351178148f7dbba0479992f4d992627665f8dc1d5cb0

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