Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a896e462c421f44…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 11:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7cb14193054b3693feb795ee8dc2075c SHA-1: b21db83325cfa2d1890e2aedc8ed7cffa955ae60 SHA-256: 2a896e462c421f44eab775665b0ffaeed815d3988cbd199cf612ff15550375fe
184 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the presence of external URIs and link farms pointing to compromised WordPress uploads, suggesting a phishing or malware distribution scheme. The document also contains lures such as a download button and a callback phishing pretext, aiming to trick the user into interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=cara+open+vpn+android PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a34ed6fd5f---30191577383.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/lofibobigaxarujilexiwubu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6758973fb7591b70597cf550daea193f/33287688090.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/nomekabivusiba.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/kebap.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/41945929207.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/nowene.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/mapewaret.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/15545776571.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/tatop.pdfIn PDF document text
    • http://e-sportis.com/images/upload/zojusexizuwetozepor.pdfIn PDF document text
    • http://wirheiraten.de/images/file/41503709584.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/pipaxofoxakuden.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374e651fb12---97837987774.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/59340187553.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/bekibixuvobo.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/pigodeju.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/vaxudasudoxeter.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613661b715d9b---kipubefosetodejetevukusiw.pdfIn PDF document text
    • http://e-sportis.com/images/upload/25462342247.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/80196541467.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/nafogivixe.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/xomin.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/kimasusagobuwepovele.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/44916879525.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_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 17780 bytes
SHA-256: b72f57b31d61be0d536aa0671c38bee03904029366f9f8871c7d6373a5f3aaed
font_02_sfnt_off00012555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12555 10172 bytes
SHA-256: c77ec0b4e12669acff2a5fbf1ad07695910420ba69638cb902940e56c5059174

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