Malicious PDF — malware analysis report

Static analysis result for SHA-256 508d931b2bcbced3…

MALICIOUS

PDF

110.1 KB Created: 2021-08-09 21:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 2f9117f0e8529db3195e2390905bba9e SHA-1: 4d4319a31136eadedfa8abf3e1c933ec87583532 SHA-256: 508d931b2bcbced34c98053bb1e9f986f3f2e4cfd0b8dccd686015c196afa8e7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a security-bypass lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9842

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soechi.com/userfiles/file/77079934472.pdf In PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/90461556176.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ekjpeh2ngjn9sctrrf13ah052j/51552092349.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960056e3818---wenufonit.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/zonidivakivusopu.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/051903286103.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607378f279170---zepanojasanatuba.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/53876264135.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4604896be---jorerojitexarebar.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706d57c7669---vosexip.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/ledijinarosupefufisoper.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/28489518943.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2759d8e3c1f99d2e126a7da28107c1bf/54196652973.pdfIn PDF document text
    • http://hkalc.com/userfiles/64572996085.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/73051220128.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106140315023376.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16071cd1362316---kexigenumufowi.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/datunazajegudokibap.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816a1f0999d---79170777187.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/jexufividozofirerovusutaj.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/o7bm72rp6dphsugevb9djsasqc/8408537739.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/kakotutusivorebib.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/45a8faf55ca26f2f063a7dd2de4135d0/59180862845.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nitolusaroku.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2ba974e3b---xireko.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/30820970046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+x+force+keygen+autocad+2019PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 32364 bytes
SHA-256: 69828c79898b2b6de52f7659db8eec823bf9b31e08b5dca86ad46bd1181c3856
font_01_sfnt_off0001466e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466E 18952 bytes
SHA-256: 10a9b7e02b3eae257e4f2254ad554a6fec4192bf14ce158c84e5b2014305cdd7
font_02_sfnt_off00017680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E97 11348 bytes
SHA-256: d5ad632392227b477ae57b51d231f65acbcfe11bf79c7df5c4ab7141e9b53b5f

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