Malicious PDF — malware analysis report

Static analysis result for SHA-256 955875c4c8f30a70…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 21:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1efee33ac9de962977840990c6fa61e4 SHA-1: 55de47b1876ccc4a29779e611a55c1cd36a2f302 SHA-256: 955875c4c8f30a70d8c608a18ff9e31ca7937d29a6c702aacb6a3bdcf6f42fdd
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a visual download button lure and links to compromised CMS uploads and disposable hosting, suggesting an attempt to trick the user into downloading a payload. The presence of multiple external URIs and a link farm further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://berallebags.com/UploadFiles/FCKeditor/20210917091429.pdf In PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3427747b1765b3ddcddb2e98e90247d7/zivogixupiluzanup.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/17029709212.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/97511264345.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161426f33ded9e---desaxufe.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/66262387062.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109140423424714.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/51782587819.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/lotufeladoreketijipowired.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/u02u8u5q61ukd9ebb803r7lbeq/32495832207.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/32042507322.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/xotodumodevus.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/12697569865.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/gawusel.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/fitolifenoluzetixokolo.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/kimubisi.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/94543843137.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132bde7d1103---91283120203.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/61017570595.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/76a1846c25f47f2b222fe8413926d551/9808403226.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/33304103614.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/liwisuvekinunudider.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/64787995536.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a21e0f375---53519236520.pdfIn PDF document text
    • http://bscartridge.com/pic/zowijupujivimoxetoz.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/bepolirezepatosalel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=subway+surfers+hack+version+download+for+pcPDF 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_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 11292 bytes
SHA-256: a9846f6ac8d0c708dc1d4db6546c4aae13af05f4cf2775c3c216fda150f7fe72
font_01_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 18328 bytes
SHA-256: 409719fbb25d6b6ed1d0580df7b96f9434dbac8a99dfecd4c67a3022554430c2