Malicious PDF — malware analysis report

Static analysis result for SHA-256 74742e94da0fc41a…

MALICIOUS

PDF

99.2 KB Created: 2021-08-14 05:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 4394a8aa6c6cd72922a5166a6d8ed0d0 SHA-1: ac99381f8e752735bd61e3901a1815e1084cf041 SHA-256: 74742e94da0fc41a3c228a526f81e2bc65ad430372e0cb72292105d472d3fb2d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm strategy, with numerous links pointing to PDFs hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://lightningriskassessment.com/ci/userfiles/files/vilivakalepage.pdf In PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfd71193ca---48111468593.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609489c01cad7---91384826475.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/lowujuvewa.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fe496d6160d---kogobopuviridepukaputil.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/dexibifoke.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfb396c3c9---zojipozi.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/bawejofuzuza.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/2162764893.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/33750033075.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4322ce655---1500517644.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/baa267725364795aa389d92f3a354578/wavakolesatek.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/jirotufuvomujameturawaj.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/29944294413.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b1acffbbb110ca57910679c42879a3b4/duxus.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/e0ee237e98d5f7e9afd6b3258f192634/25081442825.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608806eeabb5f---loxula.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210601_205501.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/12366d044a888b073d1b7a787bab9953/pefusameruripoloxikimur.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/820341564ca4af9d872632ed92a91eb5/zurupun.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/42721657612.pdfIn PDF document text
    • http://df-2.de/images/daten/file/levizafidelosezijevapig.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/remirutudosexif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=qu%C3%A9+es+el+sistema+circulatorio+abiertoPDF 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_off0001209b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 10740 bytes
SHA-256: 601beb62171e0d896e6d38e0c1a4f4a8acd6031af253653014e3adb3bd42ee5c
font_01_sfnt_off00013922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15134 17064 bytes
SHA-256: 75b9d3fb3c9babee44e083e25b46785c4ad727b6b6ad61e9213b907a16021920

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