Malicious PDF — malware analysis report

Static analysis result for SHA-256 618f6cc823561eb1…

MALICIOUS

PDF

91.1 KB Created: 2021-09-12 20:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5180c75c9452f3455bc884a613836b54 SHA-1: e3b3bf9cb589705081aeaba01b05fbe54dac5ce7 SHA-256: 618f6cc823561eb1db7eb36da35c3b3cb80c546ac66012f0618a4b033128899a
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and a deceptive download button, indicating an attempt to trick users into downloading additional malicious content. While no scripts were directly extracted, the nature of the PDF and its embedded links suggest it is designed to facilitate the download and execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • 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://queure.ru/uplcv?utm_term=physical+science+class+10+in+bengali+pdf
    • https://jajugroup.com/ckfinder/userfiles/files/99890046798.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48c507c9e---86774233997.pdf
    • https://rumahbaruku.com/contents/files/60953813762.pdf
    • http://nhahanghienminh68.com/upload/files/97754086034.pdf
    • https://tranthachcaodanang.com/uploads/image/files/vikifusimoxeduru.pdf
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/bibex.pdf
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/paresoxopavub.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/dd711241a448029a9efa2b3dc2497b7d/vuzekiwop.pdf
    • http://minipit.com/data/files/roferelamuloxe.pdf
    • http://mvdeastudio.it/userfiles/files/bebimosavut.pdf
    • https://namkhoasaigon.vn/web/images/files/33869239916.pdf
    • https://108pizza.pl/uploads/userfiles/files/diwugedovuwemewiwesap.pdf
    • http://soles2walk.com/data/file/vovirixuwafepilu.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f0d250f6---jixaza.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/natunevitimik.pdf
    • https://drrajanmahtani.com/userfiles/files/rorerix.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/nejuwi.pdf
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/3822948981.pdf
    • http://mebco.ru/images/file/64300590898.pdf
    • http://uchid.com/uploads/file/kabijewivenul.pdf
    • http://lesbambousbleus.fr/ckeditor/upload/files/80544537109.pdf
    • https://biomisszio.hu/tmp/vogatov.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/u0nuccqc42ahcg5l7snm67qc5p/parilizikani.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e298f23620fec3d9ed524a2eececfed2/81812744642.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f842.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 16792 bytes
font_01_sfnt_off00011059.bin
40ae31640b55653e6fbddc7c0f0a5760d5fc4230d9c7f3454949191966be9a70
pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 11008 bytes
font_02_sfnt_off0001297c.bin
7c6be4f16697732826012b8a3f46fbf0d0c2c01e0a4680ab8d6544209e03c78c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1297C 20200 bytes