Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ae2b0949353ea9…

MALICIOUS

PDF

96.7 KB Created: 2021-07-22 07:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b751d4db41e5549cff2daa4ee71fcb4a SHA-1: aebcd56999792a4408c86196c0f7f393befa0b18 SHA-256: 74ae2b0949353ea99ae1d3310c9a0b7d1768d02f573490e4f387fafc66fb038f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to multiple external URLs, many of which are hosted on CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/096k0rh3vrc22bkjkgmfvgqt5j/77657305744.pdf In PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/a35nj7rm1b404g6vt0737nrk36/suloganabatutixebit.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/suzebenukezegufomowuresuw.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/t6cun89i1r6utiv5inmsebcmfs/55141674509.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/rewebexe.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e3e5c036a6d6967af2f658d0e7c96696/80582595427.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3b141838bfa608b082ec10b3618eeca1/90991405900.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/6e8jqjbvagrcscda15lh39kkd4/13504802219.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/67385174007.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f3149e73013---mojog.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c62e3cdae3f---nufow.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/xajexonoragemagaxuv.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/faadd5ea3b10237f10e6d37027bd7a10/jubapufunizedif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090348110577---sevegulemazejobuw.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/29109354915.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///jinubijupexixaguzinenesu.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16087d62325455---32893188088.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/budodawi.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/rakutenojaguniwabiw.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/210193d320273d938771ed04f90bb4e6/bosekunomozitoz.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/biralur.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/8vcum2qdndpq7r0k7mf023fem2/jazokoredigi.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/jalebanasopejewujezoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=transmission+media+questions+and+answers+pdfPDF 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_off00011401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11401 17500 bytes
SHA-256: ec7f8b909b95a209358299b23f19af81c3d032cf92cbeaf8769566c176ece7ed
font_01_sfnt_off000141f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F4 10908 bytes
SHA-256: 49b4b3e1af3da3effa49b119fbdba918d43ba9baf19740b85b0e1118679a9f4a
font_02_sfnt_off00015b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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