Malicious PDF — malware analysis report

Static analysis result for SHA-256 e832be0505fa0c0c…

MALICIOUS

PDF

96.7 KB Created: 2021-07-22 06:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6737e555a525d9666b63556e25acc7a0 SHA-1: 008e05a6046dedfd11fcc05fac591eb89fab9787 SHA-256: e832be0505fa0c0c249ec53e24eeb50a9e51a1297ac47db57d47f6f284171fbe
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://namdolove.com/FileData/ckfinder/files/20210719_9F684DF9B9E46F17.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ae0110b735a---wexiw.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/zipizujitulutimumidon.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/74434638375.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/up8cbci8ci216t2rnfbicvhc3j/xajer.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/0ba78ee3b12fb0d0876343755aa7fd05/57968237882.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/mlkitnpmkanpka9f8eglsebikn/21222025639.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093af1fc1b1f---miwakorojuwi.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/9188180673.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/90909264738.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c66618ae---vupefivumejunatumito.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0f720685843555179cfa7dac84c63cc1/16238319072.pdfIn PDF document text
    • https://ayurmitra.com/files/file/josaki.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/419781378.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/92100892611.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caad22a964---venojowal.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8f62a5964bf45ca65e4b8a409c3a6508/deviwerukesukalitete.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/54135126279.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087580669b6a---panivawowolezojezafogulax.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/lujimuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=organoleptic+assessment+of+food+involvesPDF 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_off00011255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11255 18620 bytes
SHA-256: 428f7e1a73cb56c4e6fb32c552f05ab7cee1afba0104de99eab2fd3020ff19ec
font_01_sfnt_off0001432b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432B 11052 bytes
SHA-256: 3f927baafdb84b9355b40837cdc8115bc9b4e858a99b530f008b6de4431d39ec
font_02_sfnt_off00015cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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