Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ea58fbbccb1f05…

MALICIOUS

PDF

82.8 KB Created: 2021-06-29 04:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 76058b0385f30eb5985e84031f5a7519 SHA-1: 050638ba83ad4b115a9e71c19517bafe24174edf SHA-256: a5ea58fbbccb1f056c4f7723e5195cb619bbb27b5a11573427a29f1947f1fedb
196 Risk Score

Malware Insights

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

The PDF file contains a high number of external links, many pointing to compromised CMS uploads or disposable domains, indicating a likely phishing or spam distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, with the links serving as the primary attack vector. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://miracleschoolministries.com/survey/userfiles/files/zuvamupexugo.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29042e4ebe---zobax.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/jitefi.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/d1bf3a1ccbcceacc4283a67d12cdb75f/6990482400.pdfIn PDF document text
    • https://koratspring.com/upload/file/48405037586.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/30531860790.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/73696405159.pdfIn PDF document text
    • https://marigabung.com/contents//files/45487354138.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2268a268db---64333789386.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076262677e16---38391643569.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c4503a1db3---vesirow.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/r710actahmr5504dbqc7akesai/buvazuxojerujevexu.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/86878354098.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/87225686388.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc6c0a1f9c---lakuli.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5b5b81248---64289744242.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/720dbdc1ff27c315d09bbf45cbdbbda7/duvidusisixarime.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/gt6juo3lj3tam7v0ic2tjui7sk/85106251704.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021062711329_1050049349.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775fa377540---69552069445.pdfIn PDF document text
    • http://drironcat.com/images/file/99317092092.pdfIn PDF document text
    • https://guijek.com/userfiles/file/jejinipofovelibalotadop.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/57483625975.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/79209439104.pdfIn PDF document text
    • http://lucann.com/Upload/file/51160656647.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/9397883938.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/jewugot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cost+and+revaluation+modelPDF 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_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 17084 bytes
SHA-256: cb10fca86797aca7614144484f0095b78f5294cbcfa0edfbb38316e8704d3494
font_01_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 10608 bytes
SHA-256: 3d13e997e8ec41bd0e5d2e90593cc6b2513d2c8ffe2f50a4e6a854d36cf0ca1f

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