Malicious PDF — malware analysis report

Static analysis result for SHA-256 8218d06c17c6934f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 12:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5de568671d3e8626d39ce7349ccca1e7 SHA-1: 7134e3c9fb5aac504171cca79ee9da02dd88c4c1 SHA-256: 8218d06c17c6934f1581ff0b50facc020b347d53c66d0eddf343ca283097d8a5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and a callback phishing lure, directing users to contact a phone number. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://catamma.ru/uplcv?utm_term=android+app+to+turn+phone+into+security+camera PDF link annotation
    • http://yesfabric.com/images/upload/File/44749289542.pdfIn PDF document text
    • https://medius.sk/userfiles/file/79567322929.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/66938562179.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8d28e166a2efcb8138a5d9980ebba30b/50255029996.pdfIn PDF document text
    • http://regmac.net/userfiles/files/855887081.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/tazobebevirovumiso.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/94934918916.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/jofalobu.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/mefeluvar.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/kamopoxujonobezoresoned.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/budetutesitu.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/81200001717.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210914_101407.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/77488780530.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/38337429181.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rikeruramuwizijexi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145f8d5bad01---vinekuzejugidugetopewapa.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/c995740eaa9994beb2480f23a57bcef8/88065584605.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/45912081444.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/772de41ded1cfc045a52769793bfaa71/1354852893.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/72890303986.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/26549382916.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/64350466598.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210923111630_422994110.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/21674592261.pdfIn PDF document text
    • http://muszempilla.com/files/file/limepobisezumeped.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_off0000d09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09C 17792 bytes
SHA-256: 0d0ca16f27fb865c9150f175fa92402125f7a8ccec90808033b05e9bbfd1182f
font_01_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001176f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176F 10928 bytes
SHA-256: 8cb22d49ebacfd36b6fb4295f3a94ec2137baa2cb4f15913ae10afe48a6dea21

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