Malicious PDF — malware analysis report

Static analysis result for SHA-256 6317cc2e81a9b9bf…

MALICIOUS

PDF

104.6 KB Created: 2021-08-09 18:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 79791d157306d939379d0aabd1b6c05c SHA-1: dfb020efe48e27c2e916b9f2adc65cb46b962f8a SHA-256: 6317cc2e81a9b9bfdbe8c0d1ac17aa18fbff961ab893c996b3b8716d6152fbb9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and link farm nature point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://karapinarinsaat.net/userfiles/upload/file/sunaka.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4320810ca4b8da663c59a0c4c045da1c/javifafagerisumovusurasef.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ff971ed4---livabogimaxixobepa.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d71755231f4---22166142484.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/53735325244.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/73199651753.pdfIn PDF document text
    • http://myqself.com/upload/files/rotunepexijigifaga.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/3103713721.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/43894336328.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/paxovakinut.pdfIn PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/47615074924.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/40727726949.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607564952c818---xigavosuraka.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a9da2fe8---zigekomepusixazexal.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/sowufaliv.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c171aac6238---nubowunowapodoka.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/92753006796.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dib325ljtbne859n4kj5qhf3ht/xutiwanixivivefulaxo.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b78db9ef39ba2d49e84a116f87b9a47c/sukiseguzefuxakin.pdfIn PDF document text
    • http://learningkey.org/userfiles/puxinikolorevedowutajifi.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/98574239990.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/30499011483.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/gagifi.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/66424573114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=remover+ban+chat+alternative+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 17748 bytes
SHA-256: 8b5cde10413a39233e4b3d911a6fbcfb3a3b705f3035909f2338836e7449b002
font_01_sfnt_off00014ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA1 16352 bytes
SHA-256: 65da98bdd0016ea58517cee9c6b661f76511d18d115c7c11312f37107accbc24
font_02_sfnt_off000161fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A14 10716 bytes
SHA-256: ac50b1bac5845bb0a1d9ce2f42df789e91baf8514c1119e29a19815c98d9f725

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