Malicious PDF — malware analysis report

Static analysis result for SHA-256 1448a008a55163fe…

MALICIOUS

PDF

87.2 KB Created: 2021-08-06 02:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5983a381268cc51f66e5ea607aab318f SHA-1: 86ec5d8b29f86cfc1b5811ffe79b890fe0e5a2ee SHA-256: 1448a008a55163fed7a7173d0dc78b1f6870d322e418ae01e82bfe49c2852569
96 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. The presence of multiple external URIs and compromised CMS upload links suggests a coordinated effort to redirect users to malicious content.

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://ketchas.ru/uplcv?utm_term=aumento+salarial+2019+a+2020+em+mo%C3%A7ambique PDF link annotation
    • http://wsp.pl/userfiles/file/mojumadafenamurotewis.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/50550091668.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983ba9d89b7---zivepamutuwuvuti.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b08a6f15c8---powapikexomegaketamade.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608696bd0721d---42967264741.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/vevoxuvizowivebagagow.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3c7be213f---dixerikebajofanakafunuvin.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/84817744648.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/028b48c93d234219b85355fad63f7de9/76872178507.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866c7791e68---supipukikadikolavasotore.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/96300012278.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wanelakofufibinelananaduj.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/fawazigumolatafekawirada.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dfe5331b9---74834982714.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816cd11d3e0---xixipem.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/1a2da2ee0f3cd43ff9df0594a2134dce/nijajalevumapinova.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5201411546---sixuzijunonosi.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/34408442876.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d259b185bdd8eed7eda5f4ca2bf993a5/sejosipuwakekoxeda.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/78813542511.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16092c678b9880---kirowol.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/97516882438.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/gem92ph5lh0dan6tsc3uud9r35/42272774771.pdfIn PDF document text
    • http://annabarons.lv/files/files/sanav.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a09ce38e---divipisazavupezaxi.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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 22580 bytes
SHA-256: dcd2e714593e0a204147d12ec39ca422addc7f1d8aa05ded5561a7515511848a
font_02_sfnt_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 11296 bytes
SHA-256: d629dd38dadbd64f66070d6e960052ec369a76def1132927753b7f1d0476a7be