Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fc461667b0be3a…

MALICIOUS

PDF

83.0 KB Created: 2021-08-04 17:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 761cbf3ac7dada4ea664b89c8971d3b5 SHA-1: 9df7bd3c45e30944e464119d3d6513ee668f5635 SHA-256: b7fc461667b0be3af2eb3f352c034cb6c526cfca85086740d35395a6a0dacdda
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of numerous links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.asap-recruitment.net/upload/file/mosigurepa.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a523b9ddf7f---gubagajudagotiz.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/kadisesixeli.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/21a95fb762ab3d06f0cb57dc1117dd0b/jewiwanitusitoxiniwu.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/77391755245.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/wizumutofuvefotijax.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d9dd38421---5641151284.pdfIn PDF document text
    • http://phoenixturkey.com/upload/ckfinder/files/xupugos.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/b70f2635b24502b5a78256cda267f82e/75852912830.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/bb07edd074a22b5f142e753ce239932b/40103701931.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/3abc3ef50b5700f937dc84abcd4040cc/30099878344.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096fed0d1745---66204613169.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/tejanivobuw.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608336648498b---gukikexasijesalaxokuka.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/22965419221.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210621095928_gvtlnd.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7fdc628419440c2eb44d9a7ba9ef657a/wosamopotalitarotipamaw.pdfIn PDF document text
    • https://hoongnau.com/upload/files/tofozonafezosamadaku.pdfIn PDF document text
    • http://mextro.de/upload/files/fuwulubag.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/q7herbuutp4s1nai7aebjcie2o/16684435704.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/56b52ba1dc4abc809816b77868c558ae/davakura.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/mezufabiwixizuvuxaribet.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7ed2b114a---natalez.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/94067537643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wii+sports+club+download+isoPDF 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
font_00_sfnt_off0000ca31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 10692 bytes
SHA-256: 52c15debaf64b9e262264bb658495cccd807a11c795335d3e81de0be66f9a660
font_02_sfnt_off0000fabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABC 17036 bytes
SHA-256: b04c1fb1d195e5575be4fd2131686b276c1334c030b74f97ddc1399eb9258f3d
font_03_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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