Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c22f64f3bbfdcfa…

MALICIOUS

PDF

88.3 KB Created: 2021-09-22 12:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c089f5550f8621c937936fbf1e35df1 SHA-1: 84462edaf1607d54799119334612492ba5531da8 SHA-256: 1c22f64f3bbfdcfaf60ac253474eae3579834eda6198572a6202132226731902
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple heuristics indicate a malicious intent. Specifically, the 'Browser extension / update installation lure' heuristic strongly suggests a social engineering attack aimed at tricking the user into installing malicious software or divulging credentials. The presence of embedded JavaScript further supports the execution of malicious code. The ClamAV detection and ML classifier also confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://tw-jia.com/uploads/files/202109180747211014.pdf In PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/dojinozufewava.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/54888050900.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/dimipivixof.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905232606177.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/60167808515.pdfIn PDF document text
    • https://funbugs.ie/files/file/fibuzogolemufipor.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/4345294976.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9n3ags3p6ghjatotou6u62dc4c/39077427901.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/91371995697.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/jitatekomojusotudoxasid.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/55727504750.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/7c4827517fc2b8552145f461fed5e9f6/48849091830.pdfIn PDF document text
    • http://delve-cr.com/uploads/43279131346.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cca65cfa0---fanikinebukutarosajiwir.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/sosirilumabatu.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/wilotir.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/33654174611.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/93740349182.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/61526253995.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/lokomalimax.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/78237876269.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=moving+android+data+to+iphonePDF 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_off0000f5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B5 17936 bytes
SHA-256: c0df3143d3ea124a19b02eeb388cfa46eef17523ef1a3cb2d4c519429a1b2d9e
font_01_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 10516 bytes
SHA-256: 7ad9e0eecf8f14e419b4cc82ba4ce500afa83be94ef039250f25aaf2f7077fad
font_02_sfnt_off00013b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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