Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7063f168d79d1e4…

MALICIOUS

PDF

87.8 KB Created: 2021-07-05 10:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9eaddf5cf341560e8726eafc3c6caad8 SHA-1: df62a54e690abf97805b9706efc1f5dcdd508af4 SHA-256: b7063f168d79d1e4633931121de3d5b2013c7d1f095d2c5f6025f6a41c337ee9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to obscure the ultimate destination and leverage multiple compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bk6vcs0qejt87nl6dfhrfmefo3/46051767374.pdf
    • http://www.mostex.sk/files/articles/file/monebetibazow.pdf
    • http://ausafe.net/images/art/files/dolazeb.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/3pouno7fkks6b7u4lkdtcveobi/31045458628.pdf
    • http://huucodatlanh.com/userfiles/file/lolezolutuno.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c24ddfde02c---mimakigexojajigima.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ea77ee7f6---79813226727.pdf
    • http://afgventuregroup.com/cfiles/file/xezikuvavuwobofenuka.pdf
    • http://bumsnab.ru/uploads/files/moputikapidi.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/i55bojkg0lck51cempaih6ecn2/80385737038.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/322e6ab786065e26fc005802cc1b322c/16177048603.pdf
    • http://woods-china.cn/ci2/userfiles/files/20210607020951.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d2a1880e---68485948492.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607af931e33a5---tutunuxugenisiwe.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/waxuxudawuxabe.pdf
    • http://sevoir.hu/uploads/file/salifabafi.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9545de7bf1---9125315478.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160778f0271e7c---88387409716.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a208a4c666a---varipiguxiwuvesut.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c82b24a7---92077363964.pdf
    • http://acmemask.com/upfiles/editor/files/55337712017.pdf
    • http://arniestribu.com/campannas/file/67491215313.pdf
    • http://seabeachthailand.com/UserFiles/file/nalotupimazilibusawodu.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f65cdace54ccd8dd4f23e66c6fdd22b0/72504208168.pdf
    • http://aftckwt.com/uploads/file/49997455850.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=seaview+international+holiday+park
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f213.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 16792 bytes
font_01_sfnt_off00010a25.bin
e9428deefdbc87ef13d420ff6a20b059ea40f6eccb67292d35c1011601960d58
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 17784 bytes
font_02_sfnt_off0001390f.bin
00372781e64b2f79bc63d9c996ee750a9e4b9d95c27dbcb03fcd6765a42b9250
pdf-font-stream PDF embedded font (sfnt) at offset 0x1390F 10756 bytes