Malicious PDF — malware analysis report

Static analysis result for SHA-256 2277fd549b8c1cbf…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 22:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 15cf40ac36e0b395f4e803d5c4c753ab SHA-1: 3fc6fe6b533ae0f0e21b8afcfdcfef8f518d2b3b SHA-256: 2277fd549b8c1cbff18883cd83b4564512a1ee3c64b772ff2daa7116b0786dd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the overall structure and URL analysis strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160710a29e2aa6---mobodupefewigi.pdf In PDF document text
    • https://ev-owners.jp/userfiles//files/31922828310.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/oon287c1m2ub6ndkehrqg24nbe/vapufobon.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16073a3f314f22---sonevawezexojuvaxowip.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e2fb443cb52---sisulofumil.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/migobesifigawopude.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fcf89f37b---busovogolapilofasinoduwi.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/suvele.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/defunavejobado.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/6d7f729a6346823aa2edb8187b3097db/55176844778.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/tavokubixujebaxe.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076b6db5375f---nuwepabate.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/12657fa8bcd85eeb5821806f2ba8c0c2/59046489510.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ic62kgk25j3gquhtj4ta9hlb7c/90907622200.pdfIn PDF document text
    • https://banghenails.com/upload/file/ropeponulut.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ad76fc0ab4d---nasunufobumelifuritada.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/segabovapegi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e144a6843---99663014282.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/busilowobubifajelifegazu.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/i85j35tlh4vl6iibf1bfl2m506/mazolugujozizifivudaza.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/704c42102709c2768ef82922a771e9fd/gudifumozarilapisapamav.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/84902097758.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/70832898591.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gl495rgrj9baf1mle560av5evk/46111024948.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5cbc87347029513dc06b8113de04d3a1/sekalibovozaf.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/m909ls4qurmgvoqd97m9lr93m0/mewadelelopibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=metode+demonstrasi+adalah+pdfPDF 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_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 15884 bytes
SHA-256: 690e0a47a44297d666268ba9258b5e22494878ef3ae4ab65015eb9d6d4a95c32
font_02_sfnt_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 10756 bytes
SHA-256: f0d7fc0cd3f9f6e05175c956eb54cb96f2be807cc7b41108829f7beccd4eda5b