Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dda593f05dbfa7…

MALICIOUS

PDF

97.2 KB Created: 2021-07-14 06:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9a0ef2379bf0d7e68b51a78a4e23152 SHA-1: 62558a44f04565f18f4ad15bff757a46eb4fa559 SHA-256: 50dda593f05dbfa74ff8fd96d38cd3349e10eca418fa2eae86a2f5bd5f1cb624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. While no scripts were explicitly extracted, the presence of numerous external URIs and the nature of the heuristics suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://catamma.ru/uplcv?utm_term=make+your+own+instagram+template PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8274351bc---9960264660.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/sajexojusotegizixapudebik.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078efe17ff99---zonoxofabi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b0661854795c11cf2f73e4ecaaab84e5/15074793887.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607056c753f26---60220250676.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0216eb9f5---13931373233.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/69918742904.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/ldqffgs685jtla4f7pugcsas1vo5cu4g/62986588231.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/lubotamov.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/nilipop.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/dukopizonuzomizim.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/93899733630.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/90c027a05a20a3926b027fa09018291a/90692081942.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/aaqjks2hue4gjrdtpjct2qpqoc/pizuzimu.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/10847244418.pdfIn PDF document text
    • http://temple.mo/userfiles/file/20206715908.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b05c7e5a4---90976835859.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/31948976437.pdfIn PDF document text
    • http://xn--299akc5b432k2sev7g.com/FileData/ckfinder/files/20210702_58E95B135757FF30.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078439f47770---27206480691.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078bba729567---4114591026.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/kipidija.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 17536 bytes
SHA-256: 420453158ac944a33067009c30c15d770c468095ec5ad7911dc8cc95a9beec70
font_01_sfnt_off00012d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A2 16240 bytes
SHA-256: a3124206435378f24bee2884b1e93d6bc131e7076067fd265f94c2888dd4337a
font_03_sfnt_off00015b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9A 10980 bytes
SHA-256: 747192cf96d8d069b68e6cfec3a4a05c91b0343801707fdfa1f542c4df041c33

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