Malicious PDF — malware analysis report

Static analysis result for SHA-256 a674dd588775472c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 14:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3354466fa0b37fa7f0c94b11a17e9549 SHA-1: 59ae04f6daf8a59a011b1c50f47cd72956d325f3 SHA-256: a674dd588775472ccdaf52fbf6d180db63521e675d58e8692172f757a0f557fd
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are compromised WordPress sites. The presence of multiple PDF files hosted on these sites suggests a potential chain of infection or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/noputibidudosuwovibipumet.pdf In PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109db3b86469---30690903200.pdfIn PDF document text
    • http://labotinnghia.com/img/files/nopogedutisabinudunuze.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/serazebaro.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/vuvorudawef.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160abb11f4fb28---dutabopozegepigukudoxa.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/13517471947.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607754495015c---69108643458.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609e84391e6fe---setum.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/ad130d5b41be1f893f3f0ba11bf8dfa6/nadakivobulelafupego.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/dadd33695e2ecbb46d9cd81930cf8998/buxedolu.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/62857099577.pdfIn PDF document text
    • https://diphong.com/uploads/74426478820.pdfIn PDF document text
    • http://duongthuy.net/userfiles/file/97755724865.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/kowipulef.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4813ab7ab---tuwipivanov.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/24183534212.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b790c695347e37f79f80d5856e464065/1486103938.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/22660748979.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8239c3015eb76a1695c5e78190bacfb3/33250333069.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/82933825634.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160856804c717a---wewerajobunubuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=back+button+root+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 17532 bytes
SHA-256: 08ce98c2787e68b8be554c30745d119db2abfe198901d9dd82200d998baf15de
font_01_sfnt_off00010605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 10312 bytes
SHA-256: b07265afe7103336e88392dca68638838522321036099bf6438f6dc2afd545b9
font_02_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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