Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45a3f733c903ea7…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 16:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: da4b20048e4aad38dd216bf83c147607 SHA-1: dc7d9aef429c2294b63b8196a4e5637b47a4cf92 SHA-256: d45a3f733c903ea73aa9cad7b52d140df7b801b8b3550e928540750fb1c196c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some hosted on compromised WordPress sites. The presence of a 'download' button lure suggests an attempt to trick users into clicking these links, which likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://anticacarsulaeborzoi.eu/userfiles/files/gipij.pdf In PDF document text
    • https://riwg.in/userfiles/file/satasi.pdfIn PDF document text
    • http://licausi.it/userfiles/files/64245986038.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/witedafunikaxugi.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/zabalulotujaxexox.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/tuweziwuwisunugumog.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/xiretejenobuvaruditek.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5a60754e28a75add401fcf4232faf7a0/5273212270.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/4718131859.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/86522493698.pdfIn PDF document text
    • http://synphabase.ch/upload/file/pokusepujubulixisivetun.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/518b6a8409358a763f47d9fcbde23905/51153550094.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/bijikapikivoguxorapusem.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109040046418918.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/35178110244.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/lonapolun.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/26091482705.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/kafoteferewilo.pdfIn PDF document text
    • http://abnicum.ru/files/file/59845191624.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/ragoz.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161322dd63826c---vibuxinageburoxibaroketi.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/jexezakaja.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/wumukako.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/zajidon.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/sigigosowapigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ernest+goes+to+africa+123moviesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 11024 bytes
SHA-256: eea3eff3e3ecb54bc295b256a1fa77751f1e5bc3398c2384f89154e4990ca860
font_02_sfnt_off0001199b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199B 18468 bytes
SHA-256: dad6da5957ea89e478b50ec19237798003e40cb18f9b29cfe070f20b010faa1a

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