Malicious PDF — malware analysis report

Static analysis result for SHA-256 938f2710b3f511f6…

MALICIOUS

PDF

84.1 KB Created: 2021-07-14 01:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8d5eff676a8dbda0a98a3204dcaa6c5d SHA-1: 2eee7aa9a0b6a51e0fe41aac2f2bfb029406ebb6 SHA-256: 938f2710b3f511f697033a3054f88b429b1d91783c7c542f00a14cc190e0d3b3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures to phishing pages or downloaders for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608097807a079---mijuzuk.pdf In PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/18921875736.pdfIn PDF document text
    • http://strandedtattoo.com/file/82166075884.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/g6a9l2056phn4omdq1d7ljg86e/digafitibufagamej.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mf1o7sjkm2lljtlg3d5e5d1bjq/lurofezaxalinovezogadom.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/parisewu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c55eda33f44---xigizejepilatitoxe.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/12407108332.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ofvuqq6qgbv62d4tf7c3165jvv/govunedo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6b2d00ce---80793481277.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210530_51B50B17C4836796.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/saxaxarezitikogajavubas.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/darozifeduxeludivesew.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/6ks7iuumfojsm9629gcg46do04/99248074358.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/13c250a3c0648c2ebf17e85a6f8cb7d0/valibisuwufez.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lfg0jm6f0achtlujbti60k2cul/kumosowujuxobakekur.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210708/file/16257122045678.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/60620c35185003d77841f20f2e58d6af/lefulewovugimiva.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/fefijoxudaxagesosulumuwe.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/1053ae9e1093cea43cb657e01723f246/56048480129.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/molivagewi.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b8acc222883d907b9a2b662b764d91bb/75101338672.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0c0741a85---wasebozewasuguk.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a70fdbddc02---92069867158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=wow+zf+questsPDF 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_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 10088 bytes
SHA-256: dbcae7cb2736fec5d50a07da8cceef486d66c8eb1dad3397c3fd07c2b38b9979
font_01_sfnt_off0000ffea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 16656 bytes
SHA-256: c77b8a3ee32b72e638fc612b91f6a0185f754ca59709cc31a98364f88fac83f6
font_02_sfnt_off00012b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1