Malicious PDF — malware analysis report

Static analysis result for SHA-256 da561b756a1bc955…

MALICIOUS

PDF

97.4 KB Created: 2021-08-08 01:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa8c6cd7f380f59d444a2963b01f28cb SHA-1: 43b608930f5b3126300255a078374bb89cec42f1 SHA-256: da561b756a1bc955409df0f0a78d1bc75727a809401bc7dcde611108b5c513bb
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, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage. The embedded URLs, particularly those on 'aeskulap24h.de', are suspicious and likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7229101b21---82088624537.pdf In PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/29835108945.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c2eafe594dcf2303e980eaaff03d81e4/73631989591.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/pebojutabibiwatobaju.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/kuvolej.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d354aa2fe1---56424215677.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/58510534715.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d6ac6d1b4---gufafof.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cbb7b230c---47108260925.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085e30f3a9d3---kuvokosezi.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/23958630928.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a052062869---71986600067.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/240444918.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adc430bbec---bawaluzavoxad.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/22637371225.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/gonexavokugozezedoni.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/25878654847.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/busawiwipumemelu.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/rewuwigemome.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a37cea81319---57571789818.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/mujiwepi.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/19582184279.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/xajipekedomu.pdfIn PDF document text
    • http://safetypath.net/cms_images/80102929300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=s%C3%A9quence+synonymes+antonymes+cm2PDF 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_off0000fbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEE 19816 bytes
SHA-256: 489a6efd538d1ae4fc1a1ed604ade3abca81a5272ab59d94a4c3359ed1d3b0d8
font_01_sfnt_off00012ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B4 16172 bytes
SHA-256: 057bb308480cff418d953a99209f0ef68dbaf4b0429db75c25a583507c4be534
font_03_sfnt_off00015c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C55 10864 bytes
SHA-256: 7ff4159105b1bb8dce845dc6600d28d6783f7870e9c804cf6f49b4b1f45c54de

Open this report in the interactive analyzer, or submit your own file for analysis.