Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a2c1aff6f13df5…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 18:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5f15bac0944a851043d2fd73055e6e19 SHA-1: 041f4bc9c3292d84c793d5ee0f8b42ddb9d08b15 SHA-256: d1a2c1aff6f13df586ad966098fa4f70fdf202e1a8d4ca4b14dd334acdebc008
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous external links, including one pointing to a compromised WordPress upload, and another using a UTM term redirector, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the PDF structure indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=online+qr+code+scanner+free PDF link annotation
    • http://3bbb.fr/ckeditor/upload/files/jixiw.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/pumipukavod.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/32237143805.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/72067848610.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/10602577659.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329c8e6a7c9---33509414081.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/88097726496.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/64vr9ffo02gl12migg4n5fstbp/6203919919.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/59784325807.pdfIn PDF document text
    • http://armanetti.com/images/govemusomunuxu.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/tovakuketufufatugemejefe.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/tikelig.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/lugusoke.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/wiwepixu.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/15869008712.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/21367449338.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/71485024329.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/70673045542.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613368327edbf---30226681122.pdfIn PDF document text
    • http://cl-pub.com/files/files/xerirosigexemetakasi.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/soselimun.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a5ee0af33ad9613c62845f7ea057319d/23345469437.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/67456360811.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/45180032174.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_off0000b764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 10540 bytes
SHA-256: dade5bcac54162e24872dd0b898ae3b5122275b1a2e04096635f3119aae6030b
font_02_sfnt_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 17524 bytes
SHA-256: 40d6a8fcc3836e0b94d7c08980f341f3b4ef32e2876feef3823751fab42094e7