Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2c168863802da5…

MALICIOUS

PDF

95.9 KB Created: 2021-09-06 22:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22df28fcb90b179f670fdd85b4c528e5 SHA-1: c888b66f7528ab2f076b8da3b6ae258c4c402064 SHA-256: 7d2c168863802da5f4205a22dd4fdfcd3831424545eb9ec17556514da5078a73
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple links to WordPress upload directories suggests a common technique for hosting malicious content.

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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/92adca0a66759ae100673dea411b3018/vilitomivazex.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j4pe4rplnbhu9k66lo43tl89uf/427957402.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/63568880591.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/31213156455be608110e0a40c4ac3a14/86943955894.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070b14e932e5---49864566975.pdfIn PDF document text
    • http://w-mill.jp/images/file/moledisuwasifixu.pdfIn PDF document text
    • http://dalaichau.com/files/mukomuvaze.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/158976659fafe58d6d603bb87710c92e/buzefawedubenukerimesigo.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/96006819351.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608af077e0ecc---74465442023.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/50048033227.pdfIn PDF document text
    • http://axwelindia.com/uploads/tojujel.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/lukolebatulunu.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/7jaohdfdm4r2hp1tcje3nu4vfp/93558365279.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/waxobigo.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/304062428.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/14463630031.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/5f32bd9972014f4331ea46cdc18d0503/serupuzugevunizowoxatevev.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/97433043596.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f8cf2fead02---kaxovemoworafet.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/32499992331.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608287718d834---12647037663.pdfIn PDF document text
    • http://distributoram.com/files/file/tejinuzafaju.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071851e00f49---90991846235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=remove+watermark+pdf+pythonPDF 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_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8C 10860 bytes
SHA-256: 3dc67a0d8dbdd6b67e3973284095fb757ef6cfa8f992cded7a00567916ea31bd
font_02_sfnt_off00014485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14485 17260 bytes
SHA-256: 08cab7795963ddc94d78d41d9129be60df2ee53f970e7cd4d2fc5f879ad08e29