Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45d016e5348bc2c…

MALICIOUS

PDF

234.5 KB Created: 2021-06-30 06:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2e5b4f2f5015a620b737588257fff308 SHA-1: f889fe2f0707ce4ef7b16468776e2b804e4351c5 SHA-256: b45d016e5348bc2c1021f15ad0bb04c833051ca3c2bf9f61ccfedc88f60c6fe4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm and SEO redirector, designed to lure users to download further content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f53249a4d5---13681991686.pdf In PDF document text
    • http://booklandbooks.com/userfiles/file/sevujaxi.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/bowizezudekavagofuzidiwi.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/64666299796.pdfIn PDF document text
    • https://highrise.pl/file/86732931628.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1b31230ac1c945fedbd3b6f2402699ed/birilovenoxipedidiki.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3f7024b3b---52479042173.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608640c60f038---87725400235.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04ef0b582---rejanan.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/436c5fd9a8200ec9ef09e038594eeaa3/xakuguzovedejunuvexamak.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5208c6b108b5aa6e164ef779f74e582b/36008010313.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/rshqughlmlq6ub67k134c3ram2/beralimefirigugapus.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be068a9fc10---pidizezetisudi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd8476535---45823132511.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091554df07fa---xonotafolivelopezurep.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34de9a051---fizijakuzuvupukitawu.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/pudupuvudaduratubuz.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/323279e3ccc077b5cf848d70fdab834f/dovuxelekuvowivo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/70666636854.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/qq2c2kel2nvocdj059vlbkdmnb/80669534053.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/mabusuj.pdfIn PDF document text
    • https://aashianarealty.com/file/73412767297.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084707f5939a---ruwovowuwu.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gowozaregilewina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=words+that+rhyme+with+drivenPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00031f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31F03 10724 bytes
SHA-256: 16941cfdc82827b3601255b16c3475b694f9e5432bb1dd91e66f4c1b9c04db22
font_01_sfnt_off00033792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00034fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34FA4 21416 bytes
SHA-256: 172e197f5c294c69882ebd4d679f7ac37fef10da7579ee404d8e637f95eb502b
font_03_sfnt_off00038526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38526 16304 bytes
SHA-256: 5cc96a07519cead37a5ebccff3b0a5c1798019739161db8c002933a07876f7b1