Malicious PDF — malware analysis report

Static analysis result for SHA-256 06bfc34c7e033421…

MALICIOUS

PDF

88.6 KB Created: 2021-07-03 11:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5d203082c29b065f085b001bb3f11b32 SHA-1: c46549ae845181607717109532fec1a971fb131a SHA-256: 06bfc34c7e033421a6dcdf89d8fce8267e868787c4292e95d36638c157191db0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress installations and disposable hosting, indicating a link farm designed to lure users to malicious sites. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing and trojan activity. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ag07khpk3657f35frnvp1bi54h/vaximidumid.pdf In PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/7e4331a34efb974799f575104038b9ef/56809207879.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/lamaterosakujujenadexugig.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0h6hf8el744gm70um6kqnmmef/6893093013.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/1701747803.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce85db93537---banesoruxafuze.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c414ef78e2e---wimonivoxug.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080170ec198a---povasarok.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/69945687060.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b6eb23208c2554c87e9ee934333d9a13/58263740616.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607223413b498---xuleforaxanivazodesitus.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fae78254dc3fbacef006ce22743c3b96/53656648243.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/sakapin.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/fnubsja1j5v25ilhf2bb2j2jn4/98253230540.pdfIn PDF document text
    • http://usmleworkout.com/files/file/busitemaserejafugaviw.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/fabafajinaz.pdfIn PDF document text
    • http://iphysiology.ru/upload/81569948916.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ebe78070e---mesuzadunaxikofe.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/nikamevototuridanoze.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/powusifuwujusubupitesek.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/908c1d0312c5410bf71f214b0985689d/vipunofil.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844c589fb84---molaxejakujumopo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0039f5a620---renevefukidakebutizi.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/dp5d0e2601hr8gubehtdg66qlv/45468954033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+walk+of+the+spirit+the+walk+of+power+pdfPDF 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_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 10632 bytes
SHA-256: 686905e58ed4813939c73b176510161520542768442cc52372bc196554f43572
font_01_sfnt_off00010f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F74 17176 bytes
SHA-256: df87ac7e65c4463373d304b9d13b364c88294551209cfe193c79f8cb305d0cfb
font_02_sfnt_off00013c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1