Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f45e8305b32399…

MALICIOUS

PDF

87.6 KB Created: 2021-09-02 02:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc981d0535853c13a69d5cb77998b635 SHA-1: 535a39f18ab13188722290af8e4309040acd4d1c SHA-256: f0f45e8305b323998a92a413c78f6b342b6c662d90138721f4b680fcee556eac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://lrsinc.co/userfiles/file/jaxidexejilifukuw.pdf In PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-31/20210731192251456830.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/xesavexolefujumunugu.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/bubutedinonopigasafov.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/58546610459.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/50227220344.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/mituj9ogfagap4snntcr4mjkg2/54345137569.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/2873093029.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/56698678265.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210611_181007.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/butaturij.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/lilixotogu.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/62946142853.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/30f71ba014e4c9f9d2148f469025b326/wonerijamunipugokozewiv.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/eaf71ba9f5fa1b2eec7ee7fa845207f0/74821611540.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/82566407662.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8hmqqi6b564l866avldnj6kd03/fegalolamewejorowapu.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/84682257184.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210815161625.pdfIn PDF document text
    • http://alcantara.cz/data/file/30248935635.pdfIn PDF document text
    • http://gaudi.tw/upload/file/vitimodasekej.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/zopupupamupiwisarax.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/62085675946.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b0dc7ede---jadalojirirapig.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210821_93975ED5EAAE64FC.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=is+there+going+to+be+a+2nd+season+of+outer+banksPDF 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_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 10988 bytes
SHA-256: b0a4eabb0a2bf1e5a8766987c4b31473c7d3536bd094364efeca568f72c55e0d
font_01_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9F 18948 bytes
SHA-256: 7d878dd6c0b001b7e9cb563401674afe75e381851ab9e74c89ea93838b71cdf6

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