Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc42123b5581330f…

MALICIOUS

PDF

89.4 KB Created: 2021-07-01 13:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de83ba89259d2611770f1e1686879e18 SHA-1: 5079744ceefb255aa54bbaafc47eb021631b74d4 SHA-256: dc42123b5581330f3a7ac800a7cdea3d0658339b7999b561fd412ac6c694e22f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079e97800172---1483865422.pdf In PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/d28f5f92aff1dea91253388a25ffadb1/kizerokop.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o5c1jippk95q8tun8a20nt8mv5/fokujasajage.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/9ar3at5r05m5dttuulgmljm0vv/zemofajefewagip.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/e6f1f207908srhob43he7ngm01/82274925031.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/polavi.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078e10431b10---monuwuwewufatafugemebiwe.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/49760219155.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/46416212556.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/43830381047.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7084909f9---77696410409.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/e4i99k5kvpqjcka0o3fgprgb4h/tatodatugonawomepigonuk.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5be687e44dc7e3a8d2d23eed7f1f7f14/18892714792.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/52212168191.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/dee9f0e6094771795a9e24f4c564ba72/lopikexu.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/14292103059.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/68518643400.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/musukojave.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c13aa75187d---4539644400.pdfIn PDF document text
    • http://ashioke.com/images/library/File/30708670162.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/95de03e4fe4244efccde43153a3a35e3/90644493126.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/wazogowonetiga.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/75859767089.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fd59f56530539a34c62d1bdc9ebbd1a9/kivemefujaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bless+you+meaningPDF 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_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 17532 bytes
SHA-256: 36fff4898224b11f972e4b6f4b0376fd280999ce006ffd15bae3064d8250bc3e
font_02_sfnt_off00013f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F20 10520 bytes
SHA-256: 66e4bb840942206e699a2ec4ed81799c6074d6b840491a607a7897ef4accfdcc