Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb480ef5f981353…

MALICIOUS

PDF

96.4 KB Created: 2021-10-31 15:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cc156be6173ad3ceb0ee3088b10a6a2a SHA-1: 4efe4eb529268c165697ffc279fb715c54e84e73 SHA-256: 2cb480ef5f981353e5ab53110c8d251caed7c7b9d525ac5d84ff5c3c40bed5e8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded links to initiate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://nomylo.ru/uplcv?utm_term=what+is+spooling+in+printer+status PDF link annotation
    • http://lightningriskassessment.com/ci/userfiles/files/tixejajexo.pdfIn PDF document text
    • http://desirepara.fun4two.pl/uploads/assets/file/95104285634.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/70282825649.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/92156748333.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/28855552892.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/22347938882.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/kldppe9alroq2sjedp88qjdj25/61145514877.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/8718380531.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/77250029711.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/36451433615.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/pevafuduwopapufuximiselu.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/tekekizowemop.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/pizube.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/fimagumapo.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616ee5414b393---53093165288.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56835304707.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/tozavakupuj.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6d282b3a5e062ae74be32666e58bf92/biposofedanomol.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161659ec7d4ea7---95973628873.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/vavugenogolike.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_013603.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/lupopunemopipukomuwu.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/8526302928.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/vifadetalewenufimuvi.pdfIn 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_off00011443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 10624 bytes
SHA-256: 638c803ce74706a787221cb46499d9475fff8deb8d1aae94e9ecbd65ef472b25
font_01_sfnt_off00012c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8D 18200 bytes
SHA-256: fe65e46f6b079c205e4625a58a32ae4af6a1ee80430d5560aec5e06a2cbde95f
font_02_sfnt_off00015bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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