Malicious PDF — malware analysis report

Static analysis result for SHA-256 709528255047cc93…

MALICIOUS

PDF

95.7 KB Created: 2021-06-26 02:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: eae770a5aa0e0d9b2eefbcf5462fa1ac SHA-1: f337e9f0617ca67e5212b51ef9e6337bf0101481 SHA-256: 709528255047cc93752073d59c6b8872a042fae3a145ccfa6b1b46d33cf0a5f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to domains that appear to be compromised or disposable, suggesting a phishing or malware distribution scheme. The embedded URLs are likely intended to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://praconsulgroup.ru/pict/file/fuvujujamij.pdf In PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/kukuwigopifogusamugomev.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/giduto.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608842d37897b---59971536306.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/625e9ca14d6c110275c8687ee4b37dc5/87966216923.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942c0feb77f---15828706966.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/29290779035.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/rumotine.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08187367f---fubokumiw.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ec993a820---12872990642.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/7h987jlbdp1ike30lacsder1at/56573994085.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/bufimodixaja.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f682c87166fbea3af7a58eeec490bbc4/7560086561.pdfIn PDF document text
    • http://www.toptehnik.si/images/5566493485.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609493476a795---78000358563.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1787a93a0b90ce5dbd366274cf50081/84965876664.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a655825ceb7---zuwivafivilaxumoxirem.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/tozuwisoje.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/f2mcinfahk2epineuck4p3cqr0/lamemagesulowif.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/zatile.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d8d7eba84---refenigutotov.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3mbeva6qgbugeut2guppgi415q/juregitenedikibegeluperu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082d30dc942e---kepufal.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/dopubebajetagix.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210519211708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=style+guide+examples+writingPDF 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_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 18000 bytes
SHA-256: afcbc7a323859b99b2b378cada23bd6cfed93822aa75afe5f6c7417967903784
font_02_sfnt_off000157b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B4 11092 bytes
SHA-256: 115295b54d8cfb8de8d2ec6755de468714346819339fa8a729f49fd42dd0ed6d