Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc57b098f8c9a41…

MALICIOUS

PDF

95.4 KB Created: 2021-08-15 06:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5411547640cf954211fb2671297a4905 SHA-1: 8f9ed8f2054e4c08eb490670ef9b5ffe6ba72f4a SHA-256: 1dc57b098f8c9a419fd4e1fdb1ef9fca30b3eccd3f50e4508e70ea0446457933
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://uspeh-kursk.ru/ckfinder/userfiles/files/93276913244.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/l3kai6163rg7r90cc5mk2p6dlm/3543606254.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b6cfe5a06c69137efd99e6c8e19d0396/nakodoxobiw.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/losapofireloxevipi.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/14832662679.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1c7bdea8f---95622859173.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/daa8c26865a2cf00edb3911560f66ed9/nifonuwopatiwesud.pdfIn PDF document text
    • https://jurad.eu/files/file/10362417798.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210814075155.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/d8gpuo2fjbo49gkugv9sjsepf3/sefipupakowazilabezununav.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/28721625294.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b294be9eaff---mofefogaberav.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/difimiponawaninotebogu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90fb5da1a---73601500686.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/7169289205.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/19cfd40c45b32866f190f5de70b20d69/49564093410.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/55535984170.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/48758620403.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/kidexet.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/famesikukaxudogixapit.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e756e9e949a39b5e5fab7f285f4496a3/33224968890.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/tonipimevibosowug.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/jakofibolezimipaxalapusep.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/12897636799.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/32807860057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=libro+de+matematicas+6+grado+contestadoPDF 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_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 10932 bytes
SHA-256: 52b7e10f9087577fabe05e15d3ffc09cc8fd67fbab6f90901011f810ca9323c6
font_01_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 18060 bytes
SHA-256: 0eb0a9bf0a7beed15e6f94e9aa8e3e58b6e7854f0fb1ad5f8a9a8a2f727fc17a
font_02_sfnt_off00014138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15949 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9