Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f2b4e6a27f8bca…

MALICIOUS

PDF

157.0 KB Created: 2021-06-29 04:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b3a39f89bbfe87ea8ff0af82eb02d698 SHA-1: 27acaaaf4965af9db5b511a1f3cabc936b0e0adc SHA-256: 86f2b4e6a27f8bca2f3ef9b352705e066f84706443eff367ecbc09a52f5fe6a9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised CMS upload storage, indicative of an advance-fee scam lure. The document's purpose is to trick the user into downloading a secondary payload by masquerading as a prize notification requiring parcel delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7cede170d---xepab.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/53858759762.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/giseravomejenivi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e7bb8fcb4e93d11f827286d4cefc29d3/97343387326.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4af7b66229a783a015830ac658ec38c6/kunefovizanagokoxiponobu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0ba6373a---fakagugepok.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5fafb6445eb21a279fb594f514cd88de/93157780966.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/fokusases.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6rruhqu7sla13qnbnbpfeav4j2/844019532.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/34cd7f17e1dd5e5f60c633eb92aa2fd8/tovasusakoxev.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/30684737083.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3s7tpqe74r593h04648l4n587s/niboxinefowa.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/vebabutukid.pdfIn PDF document text
    • http://kalikraft.com/images/file/konib.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/mejerubifozogi.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/n8at5286vnkkt3f0nssr0lfioj/70074232715.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/rufitubupexaxaruzemojem.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608316b3dda65---vagareruv.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080db0f390c9---36740621465.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xagukezudezaratupaxuxibu.pdfIn PDF document text
    • http://kham.vn/userfiles/file/29014649296.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/36431372865.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/baad1547ae45215ca491e0cac99ef650/43564747794.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/tefunuwexiporewodulabeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=traffic+and+congestionPDF 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_off0002008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2008A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000218a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x218A1 10568 bytes
SHA-256: 8b411bd21bbac778841bac97d0609ccfb865e134ec9107aefe360b80d04954fc
font_02_sfnt_off000230ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x230AD 21644 bytes
SHA-256: 2c6d6ad8791abfcde7b71d5bd1524b3e70a513de9441029a59dde5141f8021a3