Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dbb1296f424fa2…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 19:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef98bcb9d5f9246aeb2203f05f101569 SHA-1: 9f71405777655f4d75895d7f4463c3a9654c55e0 SHA-256: 91dbb1296f424fa2d4d2377fda84f6b3770165b38390be7024f0073a76a10234
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings point to a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://penal-garazh.ru/files/lamimuguvewu.pdf In PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/gixoburew.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/janiwetosizuvavan.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/99196933712.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/46c507def8f9f87f0cfd5bec9256e4db/35988621964.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/17681297910.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7dc254e5eff449445ec4fe7b6098de10/naramivameruwonof.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160822e73bfb8d---menaxiguxezikazika.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rf1vg87t7msoc59ai44ki3am0i/16706571870.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/36058262195.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/eb28bf7218b19ed1106e37c3a01eab78/delelovukuvewera.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3b70475b1---54707606898.pdfIn PDF document text
    • http://heizler.hu/files/file/zijatusuwovazu.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/12384828246.pdfIn PDF document text
    • http://willbramephotography.com/nuwemib.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/90643621614.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/noregexozafozapuv.pdfIn PDF document text
    • http://elitvorota.ru/f/file/38077055951.pdfIn PDF document text
    • http://goldmustang.com/files/files/rekiwolefamuzatitiwep.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents//files/7361656898.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e8ab7e41---65843803221.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/dabopokobebak.pdfIn PDF document text
    • http://xtra360.net/campannas/file/82669532357.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/lapofupasutojigerezusuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=transition+words+worksheet+middle+schoolPDF 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_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 10776 bytes
SHA-256: c5b4242f706f9e99b2ea900304fe47ba1fd76a2a6ce590f879285f099131378c
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 17004 bytes
SHA-256: fcd777b52437ebc63d0a86ecd3c5f1338aecf3e5a7e6c35cb0ae015a372147ed

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