Malicious PDF — malware analysis report

Static analysis result for SHA-256 0774d2edfc965e13…

MALICIOUS

PDF

82.1 KB Created: 2021-07-18 03:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6b8d840c1b05e8c7e11fcbdbaf32d3e8 SHA-1: d70b14ae3c391a98ae7388092b3b3552242d5d2f SHA-256: 0774d2edfc965e13d552a329db573fcc5ef4c1d1b0cee8513a266776dd7af8dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised websites or disposable hosting, likely to distribute further malicious content or phish for information. The presence of embedded URLs and the 'Download Button' heuristic further support a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e38ac0a8ed---79006371770.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/v9q75rlj3odor24sj27oh78v60/31532187374.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/37608927530.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-13/20210513015846280318.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01793a3031---ludopodekuvepuxedozefenit.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/samovabakanotinafojusag.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/lekeniter.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/etrbpbqgoqnbbi3qnaaguu9486/74017553254.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/toxelukugazizolapoma.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/gokinozaforupizavizoxarow.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/50703535780.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/kotukowofave.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3630b39dec---51047063645.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/00bb3fbcc43b8b792bf1b97582f1f252/susejige.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/bazakubikenupofukonon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=uppsc+last+10+years+question+papersPDF 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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 16904 bytes
SHA-256: 98dec01a3645897c89f6e0ec1a9e96070031389748f69a26efe4f80afe8e0157
font_02_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 10908 bytes
SHA-256: 9ff7178d26c712a8c581cbc72d6e782b7bcf953a75c555f8acc8e5d79eb5e24d