Malicious PDF — malware analysis report

Static analysis result for SHA-256 38aa7e513ffa5921…

MALICIOUS

PDF

91.7 KB Created: 2021-09-02 05:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: afdbea0309cddd922f5ab332cd84743b SHA-1: 1e439caae2a44e80603a8f39f0d5ff8ce9bd2e9b SHA-256: 38aa7e513ffa59216fe60ed30b57a685d97dff16d37008e801d5d9b64303cd5b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of numerous PDF links and the use of compromised CMS upload storage suggest an attempt to distribute malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kredoteka.ru/uploads/file/kiximezomavulutenapozox.pdf In PDF document text
    • https://armagedonspedycja.pl/files/file/vesok.pdfIn PDF document text
    • http://www.moyekolodin.com/files/41370559041.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210810005402.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b00f35efe---xoletedekakosu.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/sawizisijofur.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/vowajozamiwakibuwof.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db7930e7221---sazoguvifivatiwupiv.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/11837165665.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/37592302291.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/woluzexuxawiwida.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/68673095147.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c9ce062b343c7c26a9be455e2a6d634e/robujigegosis.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/98482216662.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/mujimipan.pdfIn PDF document text
    • https://mszukam.pl/dat//file/dewulaxijatefemiresovevun.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/l4ss8kviq7iie9pdqmmrvtepg4/71301966544.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/cf6c45329b0e9a7b63f313a020b7d638/busijesita.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d015528fa62---32376484918.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/wejarozudovedotezuzevi.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/nuzujepizutatofajut.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/2352926288.pdfIn PDF document text
    • http://holzweiss.at/34443908101.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/kezejinilumekajosezuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cool+movies+mp4PDF 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_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 10124 bytes
SHA-256: b3e27dd0a7e8dd6c4dd91236aba0b4511da072fbc099ba26b207df14f4bed82f
font_01_sfnt_off00011c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 17228 bytes
SHA-256: 4e6ecbe85584c859088a17af0dbe1657d4717df775a92ff022ea5f99052af11a
font_02_sfnt_off00014938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.