Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c1d2e7eb7b90fa…

MALICIOUS

PDF

85.1 KB Created: 2021-08-17 10:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ca7ae0c8969a44d8dd3bc9bc3f56f9d SHA-1: 9f78a3c22f81010a0b32cea8037166c5dc471470 SHA-256: e9c1d2e7eb7b90fadbc774a3071bf0a0ab3f8944d9fb3ca56212dcb882c5904e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drivescuolaguida.it/userfiles/files/genilutasipetixefudo.pdf In PDF document text
    • http://asianmosaicnyc.com/userfiles/file/disexegaporegezutijiwajab.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/334a0932f6a9108b2bbc11b6c2ed608d/14460928277.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/sugufupif.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/98593399605.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/3bfcc6f74c153613ab77854862fbef39/41817351005.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rd4qc1ku1o7tf2boc0nk3ukm3l/fudakem.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/fe6d0c16c7f54bb411ac81a4fa60b74e/mudorelebure.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160948bc3e503b---wonopajeso.pdfIn PDF document text
    • http://delve-cr.com/uploads/mivitet.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d245c94bdd28974c4f13fc4933153378/76380063705.pdfIn PDF document text
    • http://saktigroup.in/uploads/denawudur.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/17662027353.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754e6e8ff13---1968808317.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b68763ebe---takaraxemekigig.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/sereg.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210702131002_cvgzvg.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/17/75289958195.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/7168561798.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0ark5fc56u015pn6idmj1gqojq/pufeno.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab9809d6f---99481442176.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/dabozolisaguwalusuno.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ddd60bbde---14821488175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=aashto+design+guide+for+low+volume+roadsPDF 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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 11036 bytes
SHA-256: 4317229d2e25a64d803445e5270af49f8d092c0a5a46f50224979c75b095a6cb
font_02_sfnt_off0001172b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172B 17876 bytes
SHA-256: 3d2edcd777abe5c29aba3037e4c4772818da8ebe2ecc897a390b4fbf16f84950

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