Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac304f115798b62…

MALICIOUS

PDF

82.8 KB Created: 2021-08-07 21:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a035611657c84a1fda9f80183df60fd SHA-1: fad36acf1c01f8052ffbfabfd795b5fbb72d5bf9 SHA-256: dac304f115798b6201578309df21084c6817d026f4c4a22502d80d22c97e65b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URIs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=problemas+de+suma+resta+multiplicaci%C3%B3n+y+divisi%C3%B3n+pdf PDF link annotation
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pgfs8ti38skec0tnkoipft6nq4/japumolotedowakopesemixir.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/f738b0073b093887e0b8c6611f880710/18131709427.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4maruuc8p4mtkeljo1fggl77n1/13247190496.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098428fc156f---wonevulexuzozoxemujunid.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/4449366354.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070c4f2a2ef2---95666348543.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/xotuf.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/titovevubesozo.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/23996317685.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc202b83f1---lulamud.pdfIn PDF document text
    • https://medtek.vn/storage/file/52203241526.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2625ce200a---rivibegimesuvotikow.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/51690874672.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/85588006036.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/u3q8aji2vqmnd25avmg7rmniq1/kixazafef.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/gejumezu.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/jivorise.pdfIn PDF document text
    • http://suara.ru/img/file/goxilukifop.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609093abbf22b---meziluf.pdfIn PDF document text
    • https://davaocarrental.com/images/file/nudulope.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/1032cf88bb6a1544e94c7e87d2359eec/34088958489.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/93746866299.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/803dbfbde0f9f2fb89fee4c1f8835589/pexejumivimuw.pdfIn 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_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 17688 bytes
SHA-256: feeb566c0ef7118c5671b2c07acc7dd22ff6270b5f59b2f26933effa8fe48ab3
font_01_sfnt_off0001085a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085A 11340 bytes
SHA-256: 787ad2c3de003d8882ea09ed4f7e937986eae7565de261019999b9b950d839f1
font_02_sfnt_off0001229a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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