Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b3727a2b00bc1d…

MALICIOUS

PDF

72.2 KB Created: 2021-09-02 09:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b152fb7afefd0ab934aa5d8a778deff SHA-1: 7fca87f5767bae6c77910c8144ecbe725b7fcbf0 SHA-256: 16b3727a2b00bc1d2606bcaa3ef4d56777fad8f7f56c6733c9f1b87dc67e1bad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised WordPress uploads. The embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ngaa.org.au/application/third_party/ckfinder/userfiles/files/nezomulij.pdf In PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/dc8dc016935de68bcba2c057ef12e0cc/56975838301.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/68922197402.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609493ebb51c6---4504252569.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/27540994509.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609821e7ee238---44917436238.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/74263133788.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106b808dc2ac---bavipemokibof.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/romawojis.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/fubovibefi.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075180ae64c3---35440887393.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/4628235094.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5c7b2a91---51664765682.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/winakavazogegalegefubuvu.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/rcblhlsomeg46rpabkb5euur1o/sekitusazomajodudatof.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/97d9fbd67d31c023c840b6403c089c33/mugawopimosi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac47b6985a---61399975903.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/38599405061.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d84bcbeeffb3ba9534526537fa90dbea/52557572868.pdfIn PDF document text
    • http://livestocktool.com/d/files/41370732246.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/64349167269.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/t79v9nqdoj9q432u37n5ua2h5m/zuvuvozonamodeza.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/18976282277.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/11909082672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+release+password+in+pdfPDF 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_off0000ba62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA62 15676 bytes
SHA-256: 2ee4537e997b71f61c47997b68d7c31a749c82ed554df010bce9e94eb941a9bd
font_01_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 10568 bytes
SHA-256: c1aa69da78449dba6410fcaee076fce8c39dd862767b2cb807d04c8eba484fc6

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