Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6880435a3977975…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 11:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d484d6672f2a8490ad398277bd83f39e SHA-1: baf9d781eb6c3cba6b08923d7c8f98cb71b1052b SHA-256: d6880435a3977975e277d30057308aa816a72881a283cfd3592b971478071b91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm hosted on compromised websites, designed to trick users into downloading further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609261d92ae86---mizomewuf.pdf In PDF document text
    • http://brenno-tojestto.pl/userfiles/file/fovevamefevus.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a8ff30594e435a24beb0d74035da5955/50604336958.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/rujip.pdfIn PDF document text
    • http://parfumland.sk/upl/75517948258.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/onur3ridi8t6dge4702nkqnma4/39602534376.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/xifipuk.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160acce341133d---vigaxiwodoxofofujat.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/ee222d621886d8f420b95ffdf7bdbc42/1056923238.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-10/20210510014550801964.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/gelevemelelaro.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a76e3555437---mefenakeguzobonotazobibi.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/9d188be96001ceeae749758ac3b50368/dexekupenipejid.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/34984673024.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/41433919026.pdfIn PDF document text
    • http://saydersan.com/firma/files/62194704732.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/88c0ceef1dc34053a2e9b617c0329fd4/padifebegamudodojaze.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b8d953b9e---tujemopawojegiv.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e7f0e1e0ae2108949683f428ca0b2bb0/vavugipi.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac39cc5dad8---88254013173.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/234cbc257a325641e64f846b7663e235/85734331133.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/farebi.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c66b21453a24a42ecbbb7132e28b1f2d/80719027298.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/fuluzumomulizopifinu.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e20607171---14640740567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=hadoop+tutorial+point+pdf+downloadPDF 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_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 16920 bytes
SHA-256: 6e919566e21a8742b4143ed6d6227c32b44b54c3067d49b6916ca9c86440b5be
font_01_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 10368 bytes
SHA-256: 6d570c738a90d25a0a035d2ae5bdd75b644b93172e5845ce35976b5fbfa5343b
font_02_sfnt_off00011d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1