Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d7bfdc6b068e8e…

MALICIOUS

PDF

96.1 KB Created: 2021-08-07 20:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b0b6d399f18d9e6535311e7c04494178 SHA-1: 8f36324a53dc4bf05c9bb259fc2e444c8e60e75e SHA-256: 55d7bfdc6b068e8efcf0c24b5f85d37b8b36d862737ccda61c424f61733d0efd
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically by instructing the user to install a remote support tool. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and link farm heuristics suggest the document is part of a larger campaign to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3276a53650---79068360064.pdf In PDF document text
    • http://zulassung4you.de/bilder/file/belarobuwomeluvifafekavil.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9ea468280d6432e8baf6bd2a9d204970/83957742356.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/25057536006.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/6n1sgod9s4fvihqtt5fdsinoil/81924968182.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/rigikamozufi.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d8e7d06dc3e4a133cbc1fe3184b455ca/45141620258.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/dc75f70d5eb1af0e90bd3f38a97b3538/refatefunuxoxitemupu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4bad82d8---gadagulagekavod.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926f3be115b---70202106713.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eedaf3694---satupof.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/isqouqs7guq09fk1put8jmoq03/suzoduzilunofufoterir.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/a0vcm9bmm8mdv3me3io3q2ih4a/45305572301.pdfIn PDF document text
    • http://lottfamilyreunion.com/clients/878857/File/73942991526.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/42761063283.pdfIn PDF document text
    • https://luminex.pl/upload/file/18509876343.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/rukamol.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/zufijanabu.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/7uo4gs3fvlig2bh734280lbqt4/85923757402.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/bovabamozuvubojejor.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/seliginevizajapogajotu.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/92116660209.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8a0b80c6f079758d9a449fbc2752f573/xasujapigodelimep.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/29211627229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+install+focusrite+scarlett+4i4PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4F 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 17804 bytes
SHA-256: 7ecffde47df2352045622921ece32e4caed7ce0c398a5dce7201ebf8159cc2ef
font_02_sfnt_off0001411a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15931 10584 bytes
SHA-256: 015744b20ebc2b4844f08b6cb21a080a1c9578d2f0c5ab789e8efd3a0d2be02e

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