Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f0e4948e4057c2…

MALICIOUS

PDF

84.7 KB Created: 2021-07-09 00:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eff0b26dd12e8414cce02ceebcedfbc7 SHA-1: 8418f46b2c896e736d6d09eff8b34dd6ad5a133c SHA-256: 14f0e4948e4057c25d925c6097489859bb88ad3ada8748897e4896c672c2520d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=need+for+speed+police+chase
    • http://dalaichau.com/files/mukomuvaze.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ncr1fp2ccs6p1dtvu5mbp9qnr9/ledako.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7bktks3lb9thn1742kn9hfour6/ligavimiruzazoxalipaz.pdf
    • http://519pf.com/userfiles/files/wenaxuwatibaxefovobegogin.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/r3d1j4j2ivugn6d5sk4eaja9vi/futofozemek.pdf
    • http://chemonova.com/FCKeditor/file/81914932479.pdf
    • http://huijingweb.com/upload_fck/file/2021-7-6/20210706234208129897.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad87bee2fb6---59259188136.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda4ed94fc5---gomalatarevu.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/go9ve86bdo8kcmggf2old3u5k4/fozawasepebomemovowu.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f6fc73e459933e51f00b066fc367a303/97072268266.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/535a515432f7f0b30da697bd695ebd2c/mikagumudeb.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e4f7138b---refodidafawokuseluvozixo.pdf
    • https://narimasu-chintai.net/jcfiles/file/valusubotaxuxigenuxofova.pdf
    • https://aulacvn.com/upload/fck/file/51969503739.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091276b6c12e---52859384218.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/86odvd82fappdt31brdujsj6eo/domuvumimep.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/59ac9f1762b79733d6ee1dce3e4b3906/68334481036.pdf
    • http://kiszelyugyvediiroda.hu/docs/file/fiwunub.pdf
    • http://asesorgubernamental.com/images/file/47703155665.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/81140917864.pdf
    • http://phuocthuan.vn/images/pic/file/79626343413.pdf
    • https://asthasupermarket.com/userfiles/file/kuborel.pdf
    • 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_off0000eb9c.bin
a49b46ae597b02dbb8a28e91134a03c41750d2b18cfdfa7e4ccc23780cb85436
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 16180 bytes
font_01_sfnt_off0001158d.bin
2ed8b13b5316573cf7dff4cd5796010b62f84ca77e01fc812562ff18b94632b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 10492 bytes
font_02_sfnt_off00012d7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 16792 bytes