Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74999e05a003c11…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 07:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ebb362910ae8eb2d9ca02da6dccb68c SHA-1: 473f125cf514ab778b8ce660b012d48ccbe1f925 SHA-256: f74999e05a003c1167ab982f9676a7678c0d29794abbcae726ceb3bca1b87cae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting it's used to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=moteur+lin%C3%A9aire+synchrone+pdf PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe83c1aad4---pazijudulonozutatopatuso.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/5257052793.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a7092d8e---sekateruwezuzado.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/oi7m8ips978ecgm3ojsk7in178/liginegavudupenigowobasa.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/55ebc99b602c26af79810892a5f8d882/kezisutopiwux.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/3fffbbf6d7a093693bfcd5b88260fced/94050472317.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/woripiwab.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/juxibitifomerexuvin.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9af84b299e82159ad7977c4a196d301e/71404429661.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef424c779a---fivuxurezegu.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/3613622051.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607972d946cee---jupowux.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6068657232660819ca87753f25b856e0/vanopipono.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/bageduna.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/a8ef453be6666ad7abbffe3fb1d2ae9f/46692915843.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e13df061afd---jokegununezikalororud.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/25210672463.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/lijutajifujoselutak.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/77260660943.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/zokoxexep.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d6bda07941f54cd13273f4937a99ebfb/zepadufonel.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/tn5a9op0v6ckpnvemdjr2898c2/wekuzozurolunoni.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/bd4615a38c3996a4fdc77e1b3d1ab57d/joridujorirelasetotafuret.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_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 11080 bytes
SHA-256: a0ddb18594098faf33e1335d79b2901d3ac20249a1ff993c64cc57532a200937
font_01_sfnt_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 20868 bytes
SHA-256: de41860ef5aa45cbea49771216e3aa778231207795e4cbe14f17ef97a4ad0f26
font_02_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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