Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73ad90e3655fd46…

MALICIOUS

PDF

85.2 KB Created: 2021-06-30 03:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7afe3f15f7fb5cd1523e7f3a43152be8 SHA-1: 84832ef62b2ae6b45e625beb6da43ff59ba52812 SHA-256: b73ad90e3655fd4623638b8e31da7f7338c3b51d0baa730ba99826ea092eba57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate this file is likely part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.awakohchang.com/image/upload/File/orij.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/855ff30a35efacb849f66b3b39e7edf6/13607615204.pdf
    • http://mosvag.ru/img/lib/file/jojeparelovekukejiwotupa.pdf
    • http://normel.org/files/upload/file/92607303360.pdf
    • http://lnimeina.it/userfiles/files/vupasobofugaxokuvigafidu.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17bda46fe---21040685433.pdf
    • https://arch.ua/ckfinder/userfiles/files/70839737811.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a298c17faab---boduviwumufu.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507093254255008.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089913231bfe---pemenuxomubegob.pdf
    • https://studiorampinelli.com/file/faputurukeferezarot.pdf
    • https://soudurelauziere.ca/upload/editor/file/81073262359.pdf
    • http://ebiocell.com/uploadfile/file///2021052319380429.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/91767df6c2d2c8b7c5553d6ae109aa2e/82556257207.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/18936411352.pdf
    • http://syuncyoku.jp/upload/file/ziraves.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/444725c7adb54e8b90457418de9fce9b/pinikirogasopapos.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16098d657d07e1---95923174047.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0e68627435da8a4faa354099e97e67c1/zisajulamuzidiwejebe.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/342d3b52ee9d79be460ccdca606fe178/lodulilafibikijepud.pdf
    • http://soft-pro.hr/upload/datoteke/37944522422.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0d5fb722eff0db0d4ede0531bec46c2b/42351898117.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/279f64c4bab414bc1735b2081c43b5a9/fajadekifepoxi.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/a498379a91c30de026a1456fa5ded6db/lituzejisutabupida.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=process+of+agenda+setting+in+public+policy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85f.bin
e23e5fb50ca8ae69b06ee6d266793bcc53d48aa02351ec7836ccbdff3fc027ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 17260 bytes
font_01_sfnt_off0001155b.bin
3f2c8c17ae867780b8e6000c8422095e4d23fcaec877d8cd09d2c1b6b85af9b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1155B 11152 bytes
font_02_sfnt_off00012f22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F22 16792 bytes