Malicious PDF — malware analysis report

Static analysis result for SHA-256 214229bc3513fd07…

MALICIOUS

PDF

74.8 KB Created: 2021-07-03 08:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ba88e939c3a448bdf9cd5fa6fd41cba5 SHA-1: 98121597562fcd0f7b377b3a76a3cfa773e49779 SHA-256: 214229bc3513fd07629e4db4cf6949a6a623dedc4f26497b4e3d0f493403b523
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The document body is unreadable, but the heuristics strongly suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://philabc.ru/uplcv?utm_term=cellular+respiration+yeast+lab+report PDF link annotation
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b80f7101b5---77898155124.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870f15cf64a---82714898608.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ebba0e93a31b67e3a221cbc87d1c7110/renewuwawusomosaf.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/8a5d0e7bc8e4b1587805c0fbb7ae5c9f/93855202556.pdfIn PDF document text
    • http://sgpeo.pl/users//file/51191640988.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/lodawod.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210620_39C27D2FAB2A1870.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d524450a91---pusaxajaxin.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-18/20210618234105923986.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/12b7a0bd6e533c0f413dcf81b0d0d0d1/25462121610.pdfIn PDF document text
    • http://ciskmv.com/css/file/56324069603.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f822e7c1bd---sobadatu.pdfIn PDF document text
    • http://ridendo.cz/files/file/37073519898.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe776c7ba1---14125769906.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/3146067137.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/puzomojaf.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d1427db9bd058a672f6097d2f779ae3a/jijobuwum.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aab7914ead---gosabo.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b377580bc---15677581060.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/jafitubalav.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/boxukirakatifupufatuze.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/30/89775509506.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_off0000c226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 16596 bytes
SHA-256: f491a64ec5b099146185b53aa7655d459d4074a0b24a038d43e25068c5c373e1
font_02_sfnt_off00010590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10590 10632 bytes
SHA-256: ed64f4a9f9951de4adb212fb77667299e7a3c898f32b887766a53c7dec4e0422

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