Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e6725a40145b878…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 08:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5208eb4fdbe388e497786f3fc0aa50db SHA-1: 1d69a893d46425fecebbcd04844207a3a3449cc5 SHA-256: 6e6725a40145b8784907063199d3e28d5b3a573925efead265087f66f3cf34a7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-based overlay and numerous external links. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot hides a clickable element, likely directing users to one of the many extracted URLs, some of which point to compromised CMS uploads or disposable hosting. No scripts were extracted, but the presence of numerous external links suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://rilta.net/userfiles/files/dudevelemelowarofojigeliv.pdf In PDF document text
    • http://pkynfe.net/userfiles/file/mubepe.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/28168268982.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210921005131.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/13384356051.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/zowepunuwevoxu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161418a150a88c---4541204427.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/varozajewamegabelokapab.pdfIn PDF document text
    • https://n-tlg.com/files/file/dasedezikokotulewopow.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109011319591716.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/8384596049.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb056c3c2---ripopinitozavonimulojod.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/56196358362.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/juxabunesevugero.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/93640879091.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210923003253.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/mukojepafewomepu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c8457d47019a141c0d44ec31ecff3ad8/81950423762.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/31456431618.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/48543174500.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o1a5eo6flj6d0efevhu9srn755/jexemeda.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/pitobunuwojemusid.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/zasekokidobasoxebixir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=porm+games+androidPDF 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_off0000b167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB167 10448 bytes
SHA-256: 3cbb17a075a99d8318b275bbc0924940261c62b7f1ff42099c5748def5538ed3
font_01_sfnt_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 14132 bytes
SHA-256: 5c900ddd81402650bf951ed09810886ca149e264a577626cd9106ba33c12bb1d

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