Malicious PDF — malware analysis report

Static analysis result for SHA-256 b046b6ef801462e0…

MALICIOUS

PDF

72.9 KB Created: 2021-09-15 19:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e76c5f4907e31ef4c6f31d1d97841afb SHA-1: bb49eacfd4ae8671c46472ee96d1c2e7f3a1b34f SHA-256: b046b6ef801462e0399d45b2e4a57c0d63c3eb791119fb45a31e1a042eaba41e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, including one pointing to a raw IP address, and links to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=i+realized+synonym PDF link annotation
    • https://tipresentoio.it/images/file/pegeri.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/befomarewuka.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/35732246727.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/94038266014.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210911_095254.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/bevazidudal.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb9b71db6---44753128019.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/12010901530.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/zuzogobafixefudawidagafi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2200799d---kuriderovosuf.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613580a45ef0c---vibefulusofafuxomuzotik.pdfPDF link annotation
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/0fc1e3bfa9f178193384cf5d51c01774/25307461555.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/87110787700.pdfIn PDF document text
    • https://10fci.org/userfiles/file/wujudufuwutuxibovovatef.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/fubigadabosixalolugafuj.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/tusilobabiwawiwixija.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/gitixa.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/funototawobuvosofamaj.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/wifesuwalazisewiwite.pdfIn PDF document text
    • http://seamacros.com/upload/file/20816158421.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/nuvebupugugusazuton.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/bilofazov.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/dumiju.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/78963768455.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_off0000bb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 16628 bytes
SHA-256: 5575eeca6debda18739cf9afc37f3b55408983f018ed9ebafa8389ff8d9402ed
font_02_sfnt_off0000fef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 10436 bytes
SHA-256: 47e8a120e26037c88fa9185ebeab2aae9b83cc98dadc78fc45e32500e4e37140

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