Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e58507acd245634…

MALICIOUS

PDF

113.9 KB Created: 2021-08-12 18:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 037dd3ba78f0eafc5ce42d9171367530 SHA-1: 0efe02e65dc165ffb1a3149fe53b98c332bf390b SHA-256: 8e58507acd2456348bd26099dd5aac3f8e8206b3be43f2b8c3db3d896d5a3dff
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://concertwristband.com/resimler/files/vapeladufosiwapisapa.pdf In PDF document text
    • http://safarang.com/basefile/files/7645876875.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/dgbhnbgojr3rqumkcne2adibau/xegelefogubafujoxegi.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bf4176466d3728134e6f6d815f2f47c4/kanive.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/tubefodumezitema.pdfIn PDF document text
    • http://rs-entp.com/upload/file/kenuburo.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/fumup.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/berijesiwebinujepeputijor.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd34f7e587---24364548290.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/003ef2cc9716d171f1140616228789fb/bigexor.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/luzokowugumasetefifekat.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2b058d53c261c5ce995342a46750732f/woxefo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30319672e---45156684269.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e451b064b91fa21a94df0ab7bb96a070/34242083298.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de14efd906d---sajofa.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/68da325c8809e4cecf3d27b693716a95/ximoverigubepowewa.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/97789540433.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/dnnsmsgr092kdqgvfr3f3fn39e/79937606062.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/dezoluwuxut.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/042bb9f6dfa44577d23b39610245ba9e/92556555969.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/34263845727.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/sutuduripemudusu.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c5b7393d813e52e17f5733b3029c7a3b/zotezafixotogew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=characters+in+hitchhiker%27s+guide+to+the+galaxy+moviePDF link annotation
    • http://dbpedia.orgIn PDF document text
    • 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_off0001595d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595D 11356 bytes
SHA-256: 2cdab679667e6f2054f37cb3e6ea0fe7ca9fb47bcc2bd6b41ec5f342e9f147de
font_01_sfnt_off000173d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173D8 17256 bytes
SHA-256: a46dbf1f456cd42212e09ccbbd98d4c30c0e8ec097fa349caed4012ad922f8bf
font_02_sfnt_off0001a0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1