Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b76d3109d4686c…

MALICIOUS

PDF

67.6 KB Created: 2021-09-25 15:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b118105e875a60450995cbce722fbea SHA-1: bd8eae777de308983f5c1ad93265313efafa5cb2 SHA-256: b4b76d3109d4686ca66cfa22cfe39fd21e0c3fc280d6514276e6ce29c58c59fe
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and a click-outward action. It contains numerous links, several of which point to PDFs hosted on compromised WordPress upload directories, suggesting a distribution point for malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 67 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://holzbau-napetschnig.at/belizugatufawanupuko.pdf In PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/kiburasu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1aaa6800848c8627032fe2edce80deb9/82479150704.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/56811359298.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/92060148554.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/60175494629.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/78249833653.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/4359759934.pdfIn PDF document text
    • http://agmapure.com/upload/files/11077493561.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/menejavewofur.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161458d0e186fb---36275528371.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/xugaraxedufog.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/zixup.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/ruwulefokoralawino.pdfIn PDF document text
    • https://henuopack.com/d/files/43058915009.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e9412cb24f61fb14ab3293a9ec7bcdbd/xolokox.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130227c8dbb4---durufem.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/gabuzes.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/saxexokawomefak.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45572640626.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/5534877956.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/e44d8d024ceafc32a2fe13016a764043/11418922298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=2020+movie+soulPDF 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_off0000aedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F1 14152 bytes
SHA-256: cafc881403e5e2a9855c393ecf533b71218dc012e64f3b85963d6d92845bd414
font_02_sfnt_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 10116 bytes
SHA-256: fd19f97c1f5320f7c70a3d44d1acc82ecb1a3ce90f03612354286cb925f1f902

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