Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5caf4a5af4e376…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 07:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6abdfb9260dc2c04c36f017a9465426e SHA-1: d73489a35ce0e4af15940587b8e00d157154b8fa SHA-256: bd5caf4a5af4e37657f4cab37111a145ce09954e19956818abd461d107f8792b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://activepymes.com/pub/file/64822452352.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/debm04tc70jefrmi5jbl6imsib/55208673715.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160856fda132de---29647880530.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/zebitefexesuvafogexenafiw.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/lizofikavimotodokixibol.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/414b3d6a14b0b510b6355e361bc54504/21716627626.pdfIn PDF document text
    • https://j26clean.com/upload/files/17757675477.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607216c97afce---paraxirusikigawipomupovel.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/21111999012.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/82154092573.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/topaxijadajanopurimawazaf.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/nelitebarupubiwiwujekewe.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f91f6b025---605942851.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/78979483035.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2870ede6e3ef65ec1f8dfea3f17aaaa1/30629773336.pdfIn PDF document text
    • https://actor-conseil.com/files/file/jagenove.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/jedolixibiwanedopanelalav.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ce144accc6c---86029887552.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/9ce5023bedf02b81b62e55c4413c6eaf/dagomufematubovo.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/zusase.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///nirorubaxuwogi.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/n3bs3o3huj02i0oul4cetq0mub/fojamese.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/tcam4ufds9vkveb50i81jsu0fu/54693547008.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f595d07311---40314288542.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/446f41dd4e8141f054a70d0ca85c3ca6/7833177250.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/6727d57fa1533700ec5f459340383c76/176760520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=manual+caldera+baxi+main+digit+240+fiPDF 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_off0000c248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC248 11184 bytes
SHA-256: 775d117e174fd715bcb8091b3c913e6ccde107ffa64588c97f7454550aef8a15
font_01_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 15752 bytes
SHA-256: b417755a7625ccee3407c0ab886a300c8f72edd5a42d400a6f4f4ab0f4b28302
font_02_sfnt_off000104ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1