Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4c57fc520d925c…

MALICIOUS

PDF

101.6 KB Created: 2021-07-15 13:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b144e64d065a7f5fe5f9a9b1116b5166 SHA-1: c64bd530c2115b2d4d0a9c4d3a91003fec0577bc SHA-256: 0a4c57fc520d925c2a737f57fe129f31019c1d62b06daf05a11c9c32ec1caa94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified by ClamAV as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple external links suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier clean score 0.1034

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://lightningriskassessment.com/ci/userfiles/files/bunos.pdf In PDF document text
    • http://arisutour.com/ckupload/files/mokigizomenotukixavena.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f53d33ae1897a9f39019e65bacc7ff83/89312146112.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607291e1c1615---welunesebemipuzuxat.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/63408239347.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e501db3eaf---45694975378.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b404b5ce9---bofafefuxopureganajaw.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bc571b3e3d6ca6a3531951783df6f92c/97023889575.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1933_20210611234841.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/qiasj3ho5ua2l7kurt48k9q6j6/jeledeminaraxu.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/jukifaja.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/74537325383.pdfIn PDF document text
    • https://andrejc.si/files/file/domomubonevobowowilididar.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e6abdf24---wurizijagajo.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/dawasumatope.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/86d464dfa6b140413637e6fa3449f4db/73117528438.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39a2be16eb---mafadolilik.pdfIn PDF document text
    • https://badrivishal.com/media/26032717200.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ba3892f7---logovafe.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/880766c389375c76bef26be83243fe5d/vexodexojimob.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/lumuzigorok.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/q7v4j3r4dh5f1mu1q1qudjvun4/duzuwajonizakofosalamif.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/19997743856.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210616025111.pdfIn PDF document text
    • http://yilip.net/userData/board/file/fomuduberu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=it+is+incorrectPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011357.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11357 27080 bytes
SHA-256: 517f3ae6f51921496d923ff65f20af9d7196ce2ba189f009e9de51ab5cdce60c
font_00_sfnt_off0000e515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE515 9964 bytes
SHA-256: 7267ff19108a9e2509415ac813f774015b4e2fe72331bc641def3b434d7fa538
font_01_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14309 19060 bytes
SHA-256: 8e46945e82a5a70c3cfd2a7c22a01d9b3e62cf70960b33dc9fac495c1001cc70
font_04_sfnt_off000173c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173C4 9212 bytes
SHA-256: 3ed47617701431eec9c140d324baa06dbfd566c742fcac28f53804ab734ce23e

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