Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e8b0fbb64b5276…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 14:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f14d55532dac87727d3f08840198e13 SHA-1: 7d8a9f18ba0d41817f46c0c489f94470f5a350e7 SHA-256: d7e8b0fbb64b5276c46634d72202ec97cf7e72a60272a426544797d6a7952d61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/64447c1956eed7db0d992c7ebf29a090/77066397207.pdf In PDF document text
    • http://czdashan.cn/uploadfile/file/2021042903293673499.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c878acc0632---xowubuged.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/loxon.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16103a78c73b43---97674884778.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m0lfgnri17v2mne5ibbr6rbt52/novagunenofu.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/rigatoxivolekeduxud.pdfIn PDF document text
    • http://mobilenmr.com/files/files/86449158114.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/35574035589.pdfIn PDF document text
    • http://poiskvod.ru/images/file/26692122347.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/peboweri.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9f878e0b07d0ebc3412a4a6da0b91796/63367803712.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/baped.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bd6431df---pikudutivujij.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/4846c1f7a9422aa593c32b9e6943040f/94304669216.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/31734458148.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/jitoje.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf884ef949---97697563670.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda1fae0929---zuwubut.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/44146157791.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/35320704785.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9e6a9237438bdf6b319bef4c3f4416ff/44433814483.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949b590798e---42943369516.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/razelelereto.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/81703671434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=intermedia%C3%A7%C3%A3o+financeira+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d458.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD458 17316 bytes
SHA-256: 92bd25b3a66b2c37391238e282c091619118860effb4feb5a42fcb65bddee693
font_01_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 18096 bytes
SHA-256: 27240674008132a25007c2ffd079bc83475e887c4355d625f52c99e0fb8c37da
font_02_sfnt_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13289 10980 bytes
SHA-256: e992176b83cb0e1de80180346fc75c4c7be28ca46fc8a0e14f5324091d7c99d5

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