Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1dc33608572b81…

MALICIOUS

PDF

92.5 KB Created: 2021-09-18 02:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d6cc9cd920414c80c4bf23a1f34a222 SHA-1: f9027fcb3e349159682933dca9464567d60d9626 SHA-256: 6d1dc33608572b81462e816659da911ac86375b7db11aea61a3bb38b6fb173fa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm designed to manipulate search engine rankings or direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143ec37b06e6---zunulapebivavafafugumo.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143a5cc61dfe---nezewigurebodisabojenada.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/0ol2t4b2p96t3cf1i623l8243q/pazefejonoferixekudojeso.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/xixuk.pdfIn PDF document text
    • http://origo.ws/userfiles/file/zavebiwipene.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/41596116820.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/37828875678.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/76915571980.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/11499916402.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/rodurogolokiwo.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/43329332068.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136a8c221fe7---bisixo.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/56994752064.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/xenogodizojokoz.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/76326582431.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/saluda.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/nidolomemesutas.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/iulpfr28frts718q25t8o42110/gulefozarofaxer.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/forowetatovixowetavabiju.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/64809363391.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/suzekabigerorikowi.pdfIn PDF document text
    • http://519pf.com/userfiles/files/rebopajagonozeredum.pdfIn PDF document text
    • http://ibb-online.ru/f/file/48759951414.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/dopazopuwobo.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a4b1d905a---29568756134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=iphone+android+cpu+%E6%AF%94%E8%BC%83PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 2060 bytes
SHA-256: 4cdd91f471f1bfec3f228726ed7bb20e7d09f6a65001974ac0200414d37add97
font_01_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 23196 bytes
SHA-256: 93b056c0260cebaaf64a374b3a68177398c17d6d9615b83d858c54e9e8cc86d9
font_02_sfnt_off00013268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13268 10352 bytes
SHA-256: 3dbaf4526a776094c9810488dd05d6f499c864fad529d2bdc547103b959dea7f
font_03_sfnt_off0001499f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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