Malicious PDF — malware analysis report

Static analysis result for SHA-256 0903b260c4553d3b…

MALICIOUS

PDF

106.8 KB Created: 2021-08-07 18:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: a670623ecb2fc77a96af1c9d449c044b SHA-1: 65bed989e55771a9fe23531b7f49e4fdd437f497 SHA-256: 0903b260c4553d3b5113efa7860dcde4f463370490af7743cbdc388c95ac3adf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicative of a link farm used for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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://garglob.ru/uplcv?utm_term=density+lab+thickness+of+aluminum+foil+answers PDF link annotation
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072369e07fa3---gojifexujozugufap.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca76318e1---nifiwazibor.pdfIn PDF document text
    • http://cloverdiamond.com/file/660638389.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210715/file/93449279627.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160df56566054c---18907579757.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57886088d---jagedalenodegizavafixo.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/70907eb03c07599d9f175bf88e5afb6d/vumesabaloxotiret.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/foliwifejejes.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/xakanajelelazuxitevif.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/68t9fd36rao75294rc3ukqjn4l/ninibol.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160781cf556bb3---zizavu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/9pg3qbci33beb1tp38sv0kjdn2/82182262943.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/91077497380.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/a2b6495515e0e1b3d54c55a84ae8eab3/befomu.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/m59lt3j5isuk902tei939qv470/38460723463.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/worogudubuluzu.pdfIn PDF document text
    • http://fitviewer.biz/files/file/79354048305.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968fcc266a2---18534280228.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/119nbb0s34gkfgomff1a69t0i2/sumenedopotitosad.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/290d347f60bee415fbb9bb666537f78a/nejoremetibujozo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c344f9bb---devaxilevasifefajosuve.pdfIn PDF document text
    • https://hagepoorter.be/files/files/mufobiza.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8c2a5e91f86744d918b1ccb79283026/27640686343.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3f3f9c1165d12d2a7459b2667193e41b/78066131174.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/v47034pi6mah777dr6fuqtuls2/61012000615.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b232d656---basonorijube.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/99373682017.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_off00012e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 11132 bytes
SHA-256: f5bcdb949f7c9974864392cd59569d7e6e0ee3f035aba814659653c25618dfaa
font_01_sfnt_off00014883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14883 24316 bytes
SHA-256: 94557e7a8901e0cbd139f8c278697f91fef207a21c3d2b5141b34a0b36b2bb92
font_02_sfnt_off000183c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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