Malicious PDF — malware analysis report

Static analysis result for SHA-256 57052407e8a07250…

MALICIOUS

PDF

88.1 KB Created: 2021-09-23 14:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 871f87dba9f1bb8d28f5b165901d11b7 SHA-1: 81f5401c0d481769cb40de92d66314d39f6204c3 SHA-256: 57052407e8a072500b77c86d733bcb6c14656c63fcfe6f4ff47467c0e2ec2b20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on potentially compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://catamma.ru/uplcv?utm_term=crop+pdf+online+page+by+page PDF link annotation
    • http://yoshitomo-kokubunji.com/jcfiles/file/98431547876.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/wawigejararopekasuje.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/wolizujo.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/70978819396.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/misemox.pdfIn PDF document text
    • http://rrarental.org/upload/file/17157145898.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/62894222499.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/dukenogukejoxogaf.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/93615561638.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613234e24f45c---viduvawijidezafexujokobo.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/zogutad.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/88550540056.pdfIn PDF document text
    • http://3234.us/data/attachment/file/xejifiduredufirujobib.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/bulekubofixevup.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/durejafif.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/19589202382.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/60932403304.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613034ba01167---24950834409.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/11097113438.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/12681155065.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/60755722781.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/dapuxilup.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/23935833676.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109020233225092.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e885282ce---38064878346.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/defibazunaxolagesutejafa.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/ziravo.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_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 17772 bytes
SHA-256: 35f91814e8dec9a612e56bd78956051f951badad6c3e5010153b2668801fc162
font_01_sfnt_off000122a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 10692 bytes
SHA-256: f33b672cab74122274cca60f739cb4e2cecbf73102663ed61fbdc2ee72ad5363
font_02_sfnt_off00013acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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