Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c03112911e89b9…

MALICIOUS

PDF

77.7 KB Created: 2021-08-09 20:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 98b590ceadbc40397b390094f0e5d32b SHA-1: 4075bc93ae5256d70db760b4b3706d9949df0ecc SHA-256: a0c03112911e89b9062dc1af1af0c512a0a4541edde22f5a0a3ab3fccb368811
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised CMS uploads, suggesting a link farm or redirection strategy. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=vtech+kidi+photo+art+studio PDF link annotation
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/aab8dc61c94e5e09d30a95f834b73956/ruledidibajuzorubawizufo.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/21224638749.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0f0f0b8c---44377517317.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c827786608---81661226898.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/bc27691dd600e96ba17dc2ea2516fa03/86737500391.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/51905526517.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ejh73upf8oakcb51cbls09rcae/50583661653.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/87917184748.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/fkme44ph6rmg4fcigb5rtk4969/29619415319.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/92554161797.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bd56e8e4182f29033b791bca7563841f/tedisujupujenejigis.pdfIn PDF document text
    • http://kgmda.com/upload/files/15445297063.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/dapusikubikifexosa.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/09jkl6eb9j7em5aqlq0civ0b75/ludexeburexemagu.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/b238f4f5665d75b3d79aac948e9533ec/54370966981.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa117ea979---namitupeg.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f35b2b8001c54832792c72537cd42dbf/62420171933.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/30665545704.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/512856972a34cf0eff9207520e5f0ebe/domafekifofowirifikerolip.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/19675692730.pdfIn PDF document text
    • https://telenovella-bg.com/files/51694620729.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/finisawulenetatebeg.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jpqncg5n4b2r58ipecuqbbljo6/vezokitok.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/g46ompgo30g6vo254k2n3q86ai/kokujasetutinodamixod.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/7618548507.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0fef3ef0---57983643747.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/sabupite.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_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 16964 bytes
SHA-256: ec2703e2cdeb44aee3636008e176e25b4a2fc56a35f14ca0109e7f117a7432db
font_02_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 10624 bytes
SHA-256: fd8d6c4b363b1940aad42a747ad836e864419dd36bc44d1d0e2cd17b7d1e10dd

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