Malicious PDF — malware analysis report

Static analysis result for SHA-256 550f161763d9a20b…

MALICIOUS

PDF

129.6 KB Created: 2021-09-08 04:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59be316262a5ee8a54346e7634dcc041 SHA-1: 400cf5112b4ea09d8d6d1bd6364067c47d7b1178 SHA-256: 550f161763d9a20bce38a129fde052f7ed473e16ad810a86618cb7ce9c5871fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the ML classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://catamma.ru/uplcv?utm_term=mechanical+engineering+basic+definitions+pdf PDF link annotation
    • http://moyamoya.center/images/hand_uploaded/files/50278935382.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b0b40d76---31919196903.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/92151164101.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/nidobafu.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/68453614170.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784a86c2743---guwopizifuwuwesute.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/08/13/file/20210813_185642_158.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315e1a9464---53758580197.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/subip.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/zaselizuxavopuve.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/fefojuxafoxij.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/pepenimamege.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/gizujiloperivimubomonera.pdfIn PDF document text
    • https://unosms.us/userfiles/file/lokiwapi.pdfIn PDF document text
    • http://hasyo.net/files/file/xoranosexov.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/28399744154.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958ece6e501---gikawinajub.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffaaf19272---60507276716.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/sipozaxokusoza.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/noak9ikvhtmcspf3j7nqc26o36/jusiwujakesipodavafudusow.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/498b85b3283ef81acb2f5fd27276bc0f/kezozovevazon.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6e205841---62491942536.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/lenididulatapakadabip.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609016e9a1a5e---81105134691.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b74b3f621---98430790637.pdfIn PDF document text
    • 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_off00018ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FFC 20816 bytes
SHA-256: 1d6e18ae48b0a32954b83605a28c42c863ffb4073a10b315aa95e1e5e9e79c9e
font_01_sfnt_off0001c684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C684 11032 bytes
SHA-256: 5ecd320a72011f9bc65d460b5032df1eb44f0bb3ee02ac97f64eed59adbb8cfc
font_02_sfnt_off0001dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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