Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d17577c92a12a9…

MALICIOUS

PDF

105.4 KB Created: 2021-07-03 06:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a97746392e7409c78200d66ddaa4ab82 SHA-1: 660a5cbe2189ed6fdc47e623c76522c44cc79a8c SHA-256: 86d17577c92a12a988cedfa47d5ef610af3967e2efd2e5d5d6ce4bfbd1711360
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://irlanc.ru/uplcv?utm_term=lawyer+jargon+funny PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083292cd492c---gaguzodinutifigiluvidaga.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/4f8e17irum2kl8vv6i7b39vr38/74416445061.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/varevam.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1g0c14232jk76gd12uq2q3aura/babug.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/70407955817.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/beguvana.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcac9510e3a---kudafapazezusitul.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/45d9fa24d9f6b298d30d6916184870ce/domirudugowakuwewug.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/wadojaf.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/60006883741.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa99928f52---35815668802.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06be9cc8fc---sadokevevof.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede07432a0---sedojata.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c8f002f28cc7877cccd8df18de7cbba4/taxexotiwemiwotaditasi.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/69582284241.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210703112459.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03242c2d3d---nakomudenesedatikobudu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607067c1de35b---76000571528.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/46356892251.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/dc99925921d6ff7da00ee02523fd1b69/47839239123.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/61e7e4c7871b6729323b51f9279fdfee/gabamapabaxibovev.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/60112143866.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000152bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BF 10372 bytes
SHA-256: 261833dcba99ec0067118ef548a33c5b4305091fe748732974b76d32d725e4e0
font_02_sfnt_off00016a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A6B 17604 bytes
SHA-256: 4adbb1792e300922cb9a4d76767e682e14f0c6b715635fdc0c111742e3fc2987

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