Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98c5e19bf902e3c…

MALICIOUS

PDF

89.2 KB Created: 2021-09-14 02:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1b8f8e605c113868652b4a94da5cfde SHA-1: b6f9a0b2fa7bb382a72beeac6112d8335bf4543a SHA-256: a98c5e19bf902e3c652170c997e3fc00f85da5470faab2494821798401178647
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with many URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of numerous embedded URLs, many pointing to PDF files on various domains, reinforces the attack pattern of directing users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://inprovitchile.com/ckfinder/userfiles/files/bagavedigupadum.pdf In PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/88065155145.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/75699975124.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/voboxeforifemufepulas.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/jekositu.pdfIn PDF document text
    • http://citranco.com/users/files/jakopalixexenewawisupelaw.pdfIn PDF document text
    • http://gro-felix.si/uploads/kajip.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lugidipibimodaxuxopug.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/60596763667.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/rukiluvub.pdfIn PDF document text
    • https://solturism.ro/images/file/21495591051.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/rufeju.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5bdfb51a6---jeridagemifevumakuj.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/jimadarelamogufifumokovoz.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/39851850583.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/29707534905.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613662935cb14---bawuxafedigegajebixifoz.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/gimijeb.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/44996456982.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/12403847764.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/sebosijo.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/5080971530.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/nizidupexefovaduludaxa.pdfIn PDF document text
    • https://digireg.it/upload/butofevedivu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fa327d6b3---13053668164.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/26832137116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tamil+movie+new+release+2021PDF 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_off0000f60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 18668 bytes
SHA-256: c1e755a8d9dc35596021cbf6a4b07729ab618f42f1dc4b4a0e27a0a26f033a33
font_01_sfnt_off0001269c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269C 10580 bytes
SHA-256: 2cc654765966d6411b776efc5d7f15ccf29c20a46f065972648e1d6d1942e8bb
font_02_sfnt_off00013edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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