Malicious PDF — malware analysis report

Static analysis result for SHA-256 3899257da5fe2b3c…

MALICIOUS

PDF

137.8 KB Created: 2021-07-21 02:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8e72c262847b9ee09864255a63ced666 SHA-1: 7aa5c5bfeb9804f47cbf15b4cc87ca1afc727cf3 SHA-256: 3899257da5fe2b3c5ad2f73541c842f4f02234da6d8c66bd7c9bebcdb4d16227
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The presence of multiple links on compromised CMS uploads and the use of UTM parameters in one URL further support a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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.
  • 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://andrelandberg.com/userfiles/file/kukonanilo.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fde6cc0b3---wewefonifarimuzik.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/fovemubevelisavikixaw.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ed72229cbe47b6abef236845eaa5c71b/56332824551.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078828798f9d---48328053112.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8201f3559688613150cd42368c9e322b/gujofodugedakevumex.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/76704187634.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/68030955966.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75dd25b72d---zafiguxupaxopeto.pdfIn PDF document text
    • https://stopserv.ru/files/file/punagezavuvivari.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/52246235592.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/deaba38a33f02d5afcdd944dc3154dab/34361240555.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608190f19c788---lipem.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a952cddef---sulofopud.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/eb9d7a84c0e3a365a8bc137e90a834c8/51342348120.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed24a8c292---37429445020.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/fagaxefawajojif.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b723aa54d30cd4d7b7de79af7730fc66/59223598692.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608764d3abeb7---36415114334.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076134bc27d0---27688690914.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a07414fba---82362417880.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbec15771d---litekipiwetazikupuka.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609aade1d27f7---46583467193.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/90609524568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=to+the+woman+i+once+loved+pdf+free+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_off0001b86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D081 18468 bytes
SHA-256: 0dd706cabd9828ac6e167bcc7d2d64e41508a2370168e9ea0f8b07b136cd9b7a
font_02_sfnt_off00020093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20093 10832 bytes
SHA-256: a618e17201a3c3765ae0ddc5c792175922bb895f36fa82672eaf0372c8d5a027

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