Malicious PDF — malware analysis report

Static analysis result for SHA-256 271b85346164376f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 18:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e1e930682cf8e902947a8911bc5f859 SHA-1: 980f695723866ae7aad75ca757fdc7d098bd7f3e SHA-256: 271b85346164376fb9075970afc416b2b5025fed0162a400eb9a4014773d775d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not explicitly detailed, is a common method for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://philabc.ru/uplcv?utm_term=globocan+2019+pdf PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b43f3c408b---tezidiripodepufoxixax.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/31046511400.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e928eaa3902425eb19b0237551e3265b/79497718727.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/bugalekudozuro.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/kevapijabaf.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e80b55548482ca8c44dcc5af901a737d/pivoloworewirunefumo.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/29809339432.pdfIn PDF document text
    • http://huimao.com/upload/59191401107.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0fb039f4ff8e7f7ca74d20cfa387591f/bofelelirepobegotena.pdfIn PDF document text
    • http://www.polni.si/Images/files/39032232146.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/vv4kqeb3is0rfcb5tg49m7b07e/nidazoruwufi.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/faraxegeto.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/dilesakubotetozax.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/dajaregikasi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9aa21c9c---runenoj.pdfIn PDF document text
    • https://atrax.hr/files/vovuzop.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/82446611006.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/11479527401.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/segapixibafejivedapu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/034b9a3b29412c5fababa6ab75dd833f/lujexotatogok.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/nesefusotatojimumux.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/80bf69fc8b26d33999a2ecb2fad063cd/nulono.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/95655920525.pdfIn PDF document text
    • http://allasclub.com/campannas/file/padijuxarip.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/vafovemufaro.pdfIn PDF document text
    • http://harlit.com/upfiles/file/4295465748In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC5 10664 bytes
SHA-256: 5173a3ed413920b640c87ef39cdaa88db9821a1bfc23d494ae07bad05669085c
font_01_sfnt_off0000e523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE523 17728 bytes
SHA-256: 72d81adba5af7cc5243d77368d072a4ae740389f717231455bed263e7d03b6d9
font_02_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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