Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1551697dc93b4ba…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 15:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 460f8690cfa80286d60bbcf629db36fc SHA-1: eaf76443ea9140c997da6eece33fa4d31237f360 SHA-256: a1551697dc93b4bae3c1f94abae6c6d4a08fb217d06994b0382ce2718fe999b7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs, such as http://makaifuins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ea6b850c9---risenomuzega.pdf, likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://1yunnan.com/ckfinder/userfiles/files/22050189927.pdf In PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/87406147386.pdfIn PDF document text
    • http://skncn.com/u/files/vukol.pdfIn PDF document text
    • http://temple.mo/userfiles/file/totusaritizusowuwexugi.pdfIn PDF document text
    • https://activepymes.com/pub/file/jinelusuwiwij.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/58979858659.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/fuvebesedatuwilimuxovavif.pdfIn PDF document text
    • https://energooptima.hu/upload/File/71107057316.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/97195689202.pdfIn PDF document text
    • https://clubon.top/uploads/files/varogomoxajiputovafa.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/sawalutuwodunofut.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/nukifudel.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/c43ef852f2c426f92a3dc43548627621.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109201149361081.pdfIn PDF document text
    • http://idroter.org/userfiles/files/95454219377.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/deforuxaxonizakajumudu.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/gefuxoruxirodope.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161410ff146f51---62747216370.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/wagakewilizid.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/defazobojokija.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/62275714520.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210926_124848.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/21899784934.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ea6b850c9---risenomuzega.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/82440528064.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9afeda95e---bananesuxatokapifunediki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=asphalt+8+mega+modPDF 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_off0000b1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F5 10732 bytes
SHA-256: f477f049bba65f495432b95c285885b65ef3b8ed18ecb48ec12c0363f661201c
font_01_sfnt_off0000ca84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 15320 bytes
SHA-256: ff95df2fdd36639cd4442c7a547e18cb2d795f92a37291a8dcff523d96e1cba7
font_02_sfnt_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1