Malicious PDF — malware analysis report

Static analysis result for SHA-256 459d9360ea8b00d3…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 02:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b4e4b0b788366c172a274150d473f74b SHA-1: 31131533c15fc0a77d3ee979dfca461c4b38ed59 SHA-256: 459d9360ea8b00d37eb21707825087dc34ec85c10fa7e8ed6fb2fa308772ae80
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The 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 URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The embedded URLs are designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ibtaker.ps/userfiles/file/13479404144.pdf In PDF document text
    • http://yuanyoujie.vip/userfiles/file/47835259276.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/posujuradidopigumuretig.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160749850750ff---28766083667.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a359a17aa65---16151754626.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b7f9079da---82189618462.pdfPDF link annotation
    • http://carrozzeriardue.it/userfiles/files/foraxor.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/71811521264.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/cf409279d399b64207a25c566a71f385/wugegujozekunake.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/luxuxewupewabujun.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/lojavazif.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/34375100702.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/65861611104.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/j47nepajjqkmqscqb7md144tt6/43855662231.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3fee17634eecb18439181f9983d1d5a1/71586559799.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/tegugonutaxerurapabowi.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/62330574860.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/e96on5j2jibhn7joikbg4sgm59/wariwosezinaravitosuf.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/vizixeg.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/29lfsueabebvqjgugh2kj0hb4p/47011752866.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2979e602f4---4994566420.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/wawuxokewogajefate.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/63373714545.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/pixukejosonositozakexura.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/86206277061.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/naxofalemopewazofaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fatalista+zak+i+njegov+gospodar+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_off0000c84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84A 11000 bytes
SHA-256: ef3627da89dd419e149a0a87eed9bd06161232cefc705ef021f418fc1232c45a
font_01_sfnt_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 18844 bytes
SHA-256: 46c430af2455038b76ff80f3b594ee62efa303fc92ebedf2fbb16cc5f03ca2cb