Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecb062d9a6fc445…

MALICIOUS

PDF

78.1 KB Created: 2021-08-19 00:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b0a185c57f97cec205e16905f6a3c16e SHA-1: 3b7c76e42900395bc91535716a1a7c2a03aab2a9 SHA-256: 1ecb062d9a6fc4451cfdaef4e60d365160f360d93fb90a63e408640eb55d588c
164 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous links pointing to compromised websites, many of which host further PDF files, suggesting a multi-stage download or redirection scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b238588efcd---xumowukiv.pdf In PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/6nlo4c5l9u2piou4n1oq8k9q73/jumajiwipiwujujowovudovi.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/jazorubezovixasa.pdfIn PDF document text
    • http://landia-print.com/pdir/file/jotolulopuruwunakipo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607819625e711---99452008662.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/5969703204.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/95889085032.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/lajugebikunawemeg.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2cd9b761---vibujonopiw.pdfIn PDF document text
    • http://dyweisheng.com/uploadfile/file/2021080423180873499.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/oj857r593rhbcv2hadjecnb3ms/16918608594.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//70006911885.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/zinevazoduvukejazeva.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160771819bf99c---nisasajed.pdfIn PDF document text
    • https://egf.tw/test2/images/file/wezokavugifigugotavedun.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210628082238.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/98898141112.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/3510ccdc3f2bbf0b3040d4eed9ff6a33/kilariziruzeti.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/kme49tmt101dpp7maqou1be55u/27295450161.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/kidadipefu.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/9426920605.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/kowek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=anglican+yoruba+hymn+bookPDF 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_off0000cda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA0 16820 bytes
SHA-256: f452fa8e85582bf21dd17768d0b8e76fd7382e569646e64f463ec906aca49ffa
font_01_sfnt_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C4 10704 bytes
SHA-256: 1e245d6b30f5f1db550a4c9c321add3ea6e50af78c3dd3ee05e315c506f2ee95