Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9a68caceccf02c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 01:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5924ba6e9c0193152cdcfacaacbb06c2 SHA-1: c73026f267c2fdc032b73327ebb6729c02f79957 SHA-256: 7d9a68caceccf02ceb4191ed0c42682a3e5a231840ba18264cb148d76672773f
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of a 'download' button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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 http://decoworld.in/dayafter/uploadimages/newsimages/file/99291400243.pdf In PDF document text
    • http://tmtechvn.com/webroot/img/files/77213942345.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/1a707dd4fe6a72d79a9c33ab0a99250f/jidufawekuvudubi.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/wozudugobinuwumupat.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304f174bc7e---70567895631.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/68434121789.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/98266640671.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/878820599.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210907160002.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/gavujig.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/fuwitowofupexepijifage.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/sutejebo.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/88359754819.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/15243784290.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8c5346f7---64542443637.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/56189154307.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/64544932914.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/kodowekegas.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210906060247.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/rozurepenawabomuseni.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/7606544334.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/28401805426.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/56183345302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=torch+apk+download+for+pcPDF 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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 17860 bytes
SHA-256: 5c3ea984105793f883673ecd4616509904d11fef75da6d580883dca715b346b7
font_01_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 10368 bytes
SHA-256: 0da6aae2e7b11d09e9436223721bb52a52cce1bb636397c660617ba4f9904cee

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