Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1750fb078f042fc…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 13:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64d473cd2e830c622a8e45b707248407 SHA-1: 3f966a16c7bc3114a8431055d533ab28329d63e8 SHA-256: a1750fb078f042fc35e144b48358afdcb9bcdfce839b9bfbfb46b862e22d8f0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, likely serving as a lure for users to download further malicious content. The presence of embedded URLs and the heuristic 'SE_DOWNLOAD_BUTTON' suggest a social engineering tactic to trick users into initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://pistant.ru/uplcv?utm_term=how+to+convert+pdf+to+word+on+bluebeam PDF link annotation
    • https://tyeetomsfishing.com/userfiles/file/vezeraxobodexesimid.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210815_073310_176.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b759de5f54edcce2878258ff1bf6e083/53805552873.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5fd0f1e30e4e5027a64b8db3f3c866d3/dugok.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/kirirorevejozudimorobela.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6b61a112dd40f4782e2f91209b884711/23854852610.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/67384371846.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161202cd74cd96---26614212623.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/jebosifidorexawixomefa.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/32396885489.pdfIn PDF document text
    • http://waypl.pl/upload/File/42845229530.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/1ded7b4aaa36a8c159e9b54efb408cbd/kaxubenujurawulixaruko.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/88c3hl44da137ihg66pu2k9bjd/30166112013.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/xuluwigelagumipagexikilif.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/vs8m2qtu9t82jf8u05gae1r8r3/98878498467.pdfIn PDF document text
    • http://envigest.cz/upload/file/6571145443.pdfIn PDF document text
    • http://partnercable.hu/files/zapigunixoj.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630665496.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/2420246572.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60E56E40D0AF1.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/lifuribimop.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8890020ee---75689348087.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/38895935842.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf0f279eb---14732336839.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_off0000d000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 17184 bytes
SHA-256: 7c35d293fda6a85209ae3a871357decbb2af290dd76b72ee8758e981ab5f03d1
font_01_sfnt_off0000fc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B4 10904 bytes
SHA-256: f210eecb230d06763cba8baf7c42dee3f55c07f275e45ae93468fd57df436cc3

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