Malicious PDF — malware analysis report

Static analysis result for SHA-256 f156034ddd81ea6b…

MALICIOUS

PDF

96.8 KB Created: 2021-07-18 04:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab6ac5570798e8484b321d649be90922 SHA-1: e8a65e458efe278485871b4205557ab1a6b68bd1 SHA-256: f156034ddd81ea6b28644893ef4d2d966ca4dc4e42320d02edebcdaf54dfe1dc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution vehicle. The document functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into downloading further malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true malicious nature and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9eea760f1---54103943283.pdf In PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/d7oiu615i5ihc7ok7u98go4fh8/nenugasozusolut.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/632106cddaa48c09293ea577dbd2848f/digosemivuxaxavu.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/xenux.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/40025471565.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607be1f93be94---nisip.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/30163825716.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/59289952764.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210618/file/rujeweziwoxe.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/duzomew.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608364af996bd---verowevokixowekarejo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/r18ojv2gh7shlm4i02b71b62m2/jozuxibat.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/garuzupab.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/61754476246.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fe868f54c---muxogivijomurov.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/7234b2d9d4528da58ed83daf7f7c010c/99052625288.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/wolagumijixutef.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0e68875fc0bf19c88abdee4783130e4a/tolonupumibilo.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079a2c4909c8---dimubafopu.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/80adcc0687678049c0f6d50d90c48344/82610778864.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59e984b1c---bijenomukiwo.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/xigaragopigejasenaxu.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e3ddc7444ffce7ce809f56075560c939/35430182778.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076518676d97---kanedizat.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25afae678c---foxasadasunavisuw.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608000aaecc04---zobav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=basic+interview+questions+and+answers+for+freshers+pdfPDF 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_off000112cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CC 11124 bytes
SHA-256: 9bb25f77c03b86b9d2fa86beee91dc3b02da0e9301347f895c42c627085f86bc
font_01_sfnt_off00012c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AB 18864 bytes
SHA-256: 9f0f5c5415f17d99667656da8c81cd04cd4305ed794bf16f6f38d4c5fbe5fdf3