Malicious PDF — malware analysis report

Static analysis result for SHA-256 d734d62552354bee…

MALICIOUS

PDF

88.0 KB Created: 2021-07-13 18:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6aa2403a2704dc343d7c007c73544c35 SHA-1: 5581ffe7c2a0e8fd9a70bb7443251db5d9332f77 SHA-256: d734d62552354bee21863943ae1c527c0fe3cca7f84b540990d2192bc6baffcf
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious with high confidence. The presence of multiple compromised upload links suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://acecaalcoy.com/userfiles/file/bawepasizudidezuwe.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7b03441bbd8650a5a800c21a7747da1/31045930352.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0b774bd19---maduxadu.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606c924adda65---zudazupemuk.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/9662eecfecedecdf6459ecc039e8c2d1/bokifidofekujivupepubipen.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/506fa93650136f5ae305d4eca1596074/dokaverulexokejosolur.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/68890050951.pdf
    • https://altonika.pro/files/fck/file/mafigobetinep.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8f2f6b949c85927290dc4e673b37b970/danawisazobujupar.pdf
    • https://fnb-concepts.com/images/uploads/files/devizosibuz.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7a967a6c---4156747628.pdf
    • http://asiavent.com/UserFiles/file///numenolobudujuju.pdf
    • http://elementsgogreen.com/userfiles/file/toparupujeluzej.pdf
    • https://bbgpiti.com/userfiles/files/divununujilaw.pdf
    • https://napraforgohotel.hu/upload/file/zaladalisumifurubenalif.pdf
    • https://melz-feu.ru/upload/vuzisararafebivid.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160707cda6fe4b---lilawakamukujo.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/mhpa2okiugoncc1nvvk67o5v1s/80550979935.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160722b69d9ca8---vululotujugufuriditasup.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabfe4e946---bawipopijelajibagaxuxove.pdf
    • http://agiusfuneraldirectors.com/files/file/16904975790.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/jarixozutelo.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popexuk.pdf
    • http://tbm-mova.by/images_from_html_editor/file/93140375237.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8t9j861p5a252cn51tllrd77d0/48676733318.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/fediverojerulaj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=frank+wright+falling+water
    • 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_off0000f5d1.bin
4891f092b064a5f7ec5598f0cacbc3b79ff75d97892018873e5687baa3835b2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 17528 bytes
font_01_sfnt_off00012341.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 16792 bytes
font_02_sfnt_off00013b58.bin
de9bffeaebf1bcd4193e133d8bc733b3383a4a323c97b1d4f4da7aece5beba6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B58 10360 bytes