Malicious PDF — malware analysis report

Static analysis result for SHA-256 5731553463958c51…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 06:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da4c25ba468ed8616953d8717a59c657 SHA-1: 2ae0723bfbd460272041885f1ff7038d7f67c05f SHA-256: 5731553463958c5179e29cf7b2b9bb244acdd34c7b4d079f207cd2c8a0bf6b08
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of these links and the overall structure strongly suggest an attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mwasafat.com/uploads/files/45653701259.pdf In PDF document text
    • http://askort.pl/Upload/file/gikelezozirolitadoke.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6f5b7da3---fakosuginimovij.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea44a4960c---rejamilinomelesapafolu.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210911_8E6426A565F3F8CF.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/napalilulaxetili.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0ua8rbborf8aauqec779nk43jc/16173267679.pdfIn PDF document text
    • https://lazerom.pro/media/file/50426814346.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9eb307c5e8dd79f4fb72658388a5647e/sokaxegisojedenevizim.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/79117904319.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/wajatofex.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/24168671613.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/6561869309.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/taparalodada.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/guzebolito.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/71920952001.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/tidipimosifizogazipuvi.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/soviliwola.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ln6iff0ji0jn4eeudkssrtqtr3/90538830385.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/97291924749.pdfIn PDF document text
    • http://sbairs.com/datas/files/77630261259.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/4943707993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=xiaomi+app+store+apkPDF 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_off0000bb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB27 16472 bytes
SHA-256: 525e5804cc8d0222d46f52a97cd192890b8bed409732515ffa4a778be1fb45e9
font_01_sfnt_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 10360 bytes
SHA-256: 57265386dabebb89a30c396089429157116b96c77995e5561389c6f5068e76cd

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