Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb48c6404e31565…

MALICIOUS

PDF

95.4 KB Created: 2021-07-24 01:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 3f612ae56bedf58f50c8aefc31ea1f9a SHA-1: d13a28d99558396711df8963c3bc90927a93a2eb SHA-256: adb48c6404e31565ce73a2a9d2ef6f15b3c38f7dde600f5bf5a437ace5d268b4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links, many pointing to compromised WordPress sites or disposable hosting, suggests a link farm designed for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://taikenplan.jp/ckfinder/userfiles/files/15596823080.pdf In PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/3ukkujm6406ttj9bs9so456ddc/mukij.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a0e2ffae34513703b1612ae7e8b69a9c/44963496208.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tipakuditegubipo.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a81b0c317938eebc1904a6d144f14496/zezojujidijojipowawow.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/26c490f2f1e706f9c7e66deae661f654/zorumasesatadegudunek.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e72daaa01d---73473729553.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/45936063475.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc41b1064d---71179937071.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/xinevoji.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/75d6f129ffe6937e132c4ffaf7801dd4/6049381252.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/benalavuz.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/adpr7cfjo098n186mh6dsl9vc6/lofegitulufemanadibaf.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/53433328843.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160842f8674432---korokesunelupekuve.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/nukoxonelorabow.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/fakuregasi.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/padisugasimabolirubowe.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8efcd6563---dogusumalijubigitesukosi.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608200860f3f7---40840080467.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4fa0e71c4---vemiwadafefibudozozanig.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/72868655993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=prime+minister+kamyab+jawan+program+form+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00014ade.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14ADE 21048 bytes
SHA-256: 02da14dd80cd8cc7f402ef35cc994ffafbc150f337981654a56ba40b4d7f61f9
font_00_sfnt_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 17420 bytes
SHA-256: aeb20599f5be984d737b0e3e27f1cf367d839e02c2e86fa668ff45f310de8f1b
font_01_sfnt_off0001187f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187F 11264 bytes
SHA-256: 3e315f747edaf796065e63c22e606bc601e4e701e639b399b2112a545ae39959
font_02_sfnt_off000132cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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