Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b764a27c7c1e21…

MALICIOUS

PDF

93.5 KB Created: 2021-06-27 06:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4426f87a091f6fafded48d03f03255a3 SHA-1: d10e1677babe2a143315cd7dfdd69da2c33c59db SHA-256: 77b764a27c7c1e21d09376784727eaa5e622bf4895f7bbbde8752dbac2418a0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, many hosted on what appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=ross+young+pei PDF link annotation
    • http://naturallabs.de/userfiles/file/talowawoge.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/tumexamubekamaselusevefob.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kdu86fu5bsdhfu4vhlvqrubvm7/netewozi.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemonubigezoke.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/35ad2e6f0872680324fddabb08890602/50452109950.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c8f559168---gelazarolixukotonud.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qs8c3046bm03c571fbof13df7p/dosugufavigavatot.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/faba98ddaa775705774fcbce78c840c0/dujuxexemi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ih3bn877n0rhnko2b0s2i7ngli/rebedasuvekewolawekomajid.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/90062922797.pdfIn PDF document text
    • http://canvangdientu.com/images/file/61205692160.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c671fe4166d---xibexasobemuga.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/pilazepizikunotemilixusi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4033606ef---58210041928.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b390be8ff4b---43216739377.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160737a5d7590a---21144550057.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/32016062332.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210621200120_811780740.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/wutirudu.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/34042248377.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/81675573660.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bfdcf356c---33685333038.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/xodivevulatigepo.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010682.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10682 17172 bytes
SHA-256: 1de8688658702de6f049171f58a44d7c514b0e478de05cd6d095b59a577b3ed4
font_00_sfnt_off0000e5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 1804 bytes
SHA-256: 038a125eb32e5ea9f08f8a4fc9c41a3c458dbf86f18a2e1e120f417e329201b7
font_01_sfnt_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 10280 bytes
SHA-256: e1c53fac5f5e698d671701101703b5f60b4e3673410338d6bbba971df8f17c75
font_04_sfnt_off00013769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13769 18584 bytes
SHA-256: 93bbc1b15cd68fe3e606e0a15904fab4511056f5aa1c8233c7656dc97a821d93

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