Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb4f2a8b695cfba…

MALICIOUS

PDF

73.0 KB Created: 2021-10-10 04:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d6d151d2e3c80faf18a23412eeb0bed SHA-1: 5a4449e3dbe8c95ca8c6648900ddf9c35a8d04e3 SHA-256: 9bb4f2a8b695cfbac7363f4536b4afebfb8d2ba23b46cd6d3b955482213ab98c
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 or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and malware detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://babetravelling.com/ckfinder/userfiles2/files/tofokagexuxod.pdf In PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/pawuzomekijijiraxiwuv.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613df162b567e---kifakupiko.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/wulefivazimeg.pdfIn PDF document text
    • https://skl68n15g-n2ox.com/contents/files/pelejuzavofalu.pdfIn PDF document text
    • http://feg.vn/uploads/files/mevuzubogetasozejipez.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/57470736565.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/jigesi.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/21404917795.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/56744378546.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/gefaxenurafuxalopobuxefij.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615b9b18046a5---76747948558.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/fekizafaxavaxisekulorej.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615efa5127cd3---gigabigobig.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/83633264536.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210920235237.pdfIn PDF document text
    • http://keramann.ru/uploads/files/mekazoverunaniwekof.pdfIn PDF document text
    • http://dhf-china.com/d/files/10056621473.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/47332102a30367fa603e40e2db64cb16/xijogiwulowager.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/nabafametemiji.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/13383988895.pdfIn PDF document text
    • http://retailcop.ca/files/24370223715.pdfIn PDF document text
    • http://freetds.net/userfiles/file/vadex.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/lesojukufagekixufetivapax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=why+do+atoms+react+with+one+another+to+form+chemical+bondsPDF 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_off0000b811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB811 17040 bytes
SHA-256: e2be73bb92416fb21d0eeca5a6a3c1e2e1ca62df617b1a49cae441b410454ba1
font_01_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 11076 bytes
SHA-256: a043201fee4c497c9447cac8f4d1c6912a68aeb5fd6fc9a7baf4b20d5b0a3800