Malicious PDF — malware analysis report

Static analysis result for SHA-256 efaa71ab9e253cf3…

MALICIOUS

PDF

114.8 KB Created: 2021-09-02 23:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9122ed007c99f6882958c7d636f9d542 SHA-1: 79f1cb7d845d8f8dfc8e6fcb379f1ca57b81d0f5 SHA-256: efaa71ab9e253cf36f60e6876a17be0abddfed62ba484933fd8017de9e160bf0
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 of which are identified as compromised CMS uploads. The ML classifier strongly indicates maliciousness. The document appears to be a link farm designed to redirect users to potentially malicious content hosted on these compromised sites, serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/pl3n32ru1qlp0jrkv1chj9eob2/zifojejed.pdf In PDF document text
    • http://abwingsmd.com/uploads/files/gejev.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78fc4f853---sexitorukezifojasoli.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/84338196130.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e24c78d0d84---xisixobusafo.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/bb95da196df375c6f2e5c05a07047587/98457986951.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cf2a1743d---zusaxevebugedanivag.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d20ba10ae8c05a418aaed5733b2637f7/kopabit.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609994d5737d9---xodimodinel.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/duwazabufezefa.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/37677423589.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/62172016836.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/mapovexowugakogatanereti.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/wewekisesavebadev.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde628e0954---5076110965.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b349a06c066---92419797986.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/361dd98bd35219ee1517ff143537cdab/66183686241.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087680a86f1b---71929540191.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16088fea8c8177---pesijumidikuweve.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/voturikutor.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/rofobajefeludixerelok.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3604ce61a7533af5e8d01be1178214ae/96377354787.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/7bcc0ebcd095d45c75908c3e00344ecd/kinazezo.pdfIn PDF document text
    • https://patc.fr/imagesfile/4838759794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=hp+z230+sff+workstation+manualPDF 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_off00015bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000173c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173C9 18468 bytes
SHA-256: 0600db801e4ba2ff5dcfa467fb75dd3cef9ddbeca1fe1af25c7f487411557b97
font_02_sfnt_off0001a37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A37B 11128 bytes
SHA-256: e03f9f495aa3663dae7cc0315e34b798411e246b1c1df67523e2afaf400f1333

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