Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbee1ef42367337…

MALICIOUS

PDF

89.6 KB Created: 2021-06-27 20:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 20b2169a16056dfc5260945384f9347b SHA-1: 56c678a8040f231e8eb5dca96aad7e634402898c SHA-256: ebbee1ef42367337a685cd0a9818c546e7e6be01a5f239e2533b3b6638a830a0
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the structure of the PDF suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://crewmak.ru/uplcv?utm_term=how+many+calories+in+a+california+roll PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/bbbb1e7e98867a449466b562a9a21672/guzugikirikubokalimi.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/23ddfcd3c104a02714634af7072e53be/34416098367.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608027716df57---towujugezub.pdfIn PDF document text
    • http://ibb-online.ru/f/file/rugigitolofebikusuk.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/705eba0f6add930408ccc5032840081d/dobozuwijifaliw.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/sket84al666se2j1e5qlavgg8g/jusogobixosonap.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848989bfcec---mijebopekex.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/54233295769.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de07486bb3---zawusafiworubupuvore.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/9601331571.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/u85aq876t4arv2s06t0i89ctfl/29465242456.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2be0feb58ca4c05748928c96eba5ba79/87077877311.pdfIn PDF document text
    • https://x-software.cz/data/file/62053826263.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/km7hbnf0b484a54o6ht05hcv3v/75435404381.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/pigazupepudimimit.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/lhem6n0lbfluc5q7r4vuk79nn1/89231122559.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/pipurosixetadigetonebume.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/medoxinazimi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/41hieb08iph9r27i9jbbkk6633/mezerudifesemurojo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b457538d5cc---runuwojunababazi.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb117c496---xipubanusux.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091995cd63b5---sediw.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/74085886937.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160763df15f538---tugefuxuzinu.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/lotopubedi.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/e97ad98e41bc393be7a7a718fbb96685/difapekanesuzumemotazi.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_off0000f967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 18060 bytes
SHA-256: ccb09cfef6bb4d7f9568f0b55993e0c203653c5a60d03504ec53f817dae7ef99
font_01_sfnt_off000128aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AA 10592 bytes
SHA-256: a7af7539d51430d1e37d2c193f4ceb864aa77dffcddac6d288bc2c3c1974ad41
font_02_sfnt_off000140da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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