Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7fd44b6bc8181a…

MALICIOUS

PDF

87.3 KB Created: 2021-07-19 09:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e2b290f5fcdbda8362c8ec4b7f4b20f4 SHA-1: d11a9b7b7704149cab145eb44863c321230a7389 SHA-256: 8a7fd44b6bc8181a2da2545eed05a31fd0c3997915a044de5e8ef4a16db0fb35
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external links suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sghscsjamarai.org/guruhargobind/userfiles/file/virazuwegugadawe.pdf In PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ba9187b4dabf446c82d140f8ff43ea07/ralofaxapizekowedetibemaz.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/64635373331.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/nalfv2kgicdlta5d56ifq6soht/58681028850.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/sopowipefetitoxekade.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6968df62df0457cb16ed3c9bb4d735e3/xagazow.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/2416631392.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5efc582236---59136841842.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b865908ad---sofanuguzotevuwowoju.pdfIn PDF document text
    • http://placc.info/up_image/62725667686.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/01572c76c53ad4e272a84e4138389661/giluvivolugakekigowawo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0hrh8eft8ov1ub57am2sp2btb7/godojebejomijidiw.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5e867d2aeb93b54b7e458d58301e9241/97325207009.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4088d7ea43f81f715d158d078aa1a36d/buzepu.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/butazowasedilegezap.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210625024815.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/a000948bddd9883bf9d0f4be61af05b2/jusub.pdfIn PDF document text
    • http://metallpress.ru/files/96831683032.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/loxusireni.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/75296954983.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16088253f1e229---jevijawizezipimuvafaper.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7cb80bea---50244662426.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6568951c53b54d5027f9404dafa68bd9/robupo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/928d387bcbeb8fae8025823474f73fe5/jixapobejadug.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/51eb2db3a4ea622a3e9098ce5c4bd368/91012712053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+earth+diet+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_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 17464 bytes
SHA-256: 2fecdb62029d858dd655e4054b221be4ba4f25a0d00cb4326057a55165a08284
font_01_sfnt_off00012163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12163 10120 bytes
SHA-256: 4daa50c3f7daa218e9beddc112ac88364ea0700b00380afdc70c76e1c22e2a96
font_02_sfnt_off00013819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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