Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ab5e46a2aa9fec…

MALICIOUS

PDF

111.2 KB Created: 2021-06-30 22:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 52ea0fd95a807a75247fe5c9d06226f4 SHA-1: e4036b70752e8afd274bd3004ebd9a9224787db2 SHA-256: 29ab5e46a2aa9fec045c825704f20d571c6af1ef6829ef92bb6b931dbca197e0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a PDF link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs and link farm structure suggest the primary purpose is to redirect users to external, potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=the+emperor%27s+new+clothes+meaning PDF link annotation
    • https://ovth.ch/userfiles/files/dosefonufaruwotiradub.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/21017652934.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d583ed0a09---kokug.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/xaralizuworofewemo.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/5948134368.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/palaxirexadeku.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e97d3a2d3---56203214008.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/nipaw.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/53275747065.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609435a246944---81199401248.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/majenev.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8b90b06a7a7d3c9428f87b14d55393e9/73000937187.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/47582189463.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/76282830050.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/fibugomifogi.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/92715342621abc9397cd4cc9cf354a87/sobosivitizuvufufo.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/41829579151.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a536258da4---xokujojigovuzuvebatebi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d3ca5f479---75707666931.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/onqmpf8kjbu1fqim92rt14h734no6hlc/45349003675.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/kiwafiwegixamovitazadozad.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/jqb64jjqimldhq8bujgnkm34kq/xuxalog.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2931040b68c20da80820ea78ed274450/nizegiwamitutuvuvaj.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/fasobixesirisuxamub.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/upda3goe8pq20cdl0n16apajrt/65029637354.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001377b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377B 20272 bytes
SHA-256: a308251de576d30412134c0708ffa09540051f6a46f1f19c3420d23607e13ee1
font_01_sfnt_off00016b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B75 4844 bytes
SHA-256: bb77a4f0ea1ee4f9a844b2fd293f9ab605c53ce56cff61ebfe4a18c51469d284
font_02_sfnt_off00017dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000195c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195C4 10904 bytes
SHA-256: dabc6328ad7673e0befd66e38a2da267f9adf59e3e7cbf033b7c290367dca5eb

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