Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5252b060f2ff02…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 12:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57450c12c92c6bed07d6f687f7006eea SHA-1: 01a14f74404839ebc1270d07f8500f6c681f7003 SHA-256: ae5252b060f2ff02b2acf5bf89346ad87f24e7121d34eea0f0c9f02003e4225e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=download+ispy+pro+apk PDF link annotation
    • https://aldurra.ly/images-editeur/img/file/kegeguxobezajipogiwibumax.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138f4873f212---11815146886.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/31349291148.pdfIn PDF document text
    • http://sb-78.ru/files/file/62936885801.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/xelopibaxuzerisufonid.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614a39dfb651a---wanezuseras.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/nadimuverisoduterove.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/zotujifelunetanipavazuza.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/5519125085.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/wozozuxeworasoselakezixat.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/17896157044.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/65615709620.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/vajaj.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/73497861749.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/33113306689.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/18728944643.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/45936246048.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/92336811272.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/20116010377.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613da623d5387---58068319165.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/71814428960.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/mogowes.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_off0000ac4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4F 15424 bytes
SHA-256: 206c8bb1f4ce63305d03e750323234def086447fac4021ae5e28e0d1df023f15
font_01_sfnt_off0000d316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 10448 bytes
SHA-256: 2e572481861f587cab42e41c6781a0fa00675e8a742352dc8d5f686489e78793

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