Malicious PDF — malware analysis report

Static analysis result for SHA-256 17770c7e886a4ac9…

MALICIOUS

PDF

86.4 KB Created: 2021-07-24 11:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 67cfe6e418e6bb99fe5b56de36a2aa43 SHA-1: 3f11078d52f710d4a69f5872056ebfb9033b6572 SHA-256: 17770c7e886a4ac9f391f449a3db3684d65d479c15d5dde95f3d6737cb085bd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/kukkhhob3kq3q6jnfh1nhnrjre/fifijopozoxavoxevipuguxok.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/bt3o7ij25u9gol2n26nqtpcpds/niwosatu.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/2806669843.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/tusupabowogozulaligo.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/46033982659.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/92685120488.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/de926b3d003eb795c60ec2614dbb6ac4/11172271127.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ca069cb8aa905fa3679cea6f79a20d3a/6752809362.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1454fba37e---16168533096.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/40489041573.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083910dbf0a5---13306632919.pdfIn PDF document text
    • http://classofjoy.com/KK/userfiles/files/nefowatulitamofepubul.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/zabadinopuzagonobaveg.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/57777620436.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3cbd196b---41735178040.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f943c043e40---jezuwotonebabuzab.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/povajojaduxovigapu.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdfb2a7e1e---bamisopudunubigoxuwakew.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/rakopula.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/megekawuvenexugasiwabix.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986447e4547---lizuzefixatibajuvuwo.pdfIn PDF document text
    • https://grouptm2.com/contents//files/20466407146.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/63300872399.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/negiwugusaxenok.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/15653375368.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160f559dead2a0---90812605425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=latitude+and+longitude+map+worksheet+answersPDF 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_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 17084 bytes
SHA-256: 49bbc125707119580d1ae0074ed450d9216e2c3766df10bb841436003be03342
font_02_sfnt_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 11076 bytes
SHA-256: 5c12e29f1ff6a14a6989a058df6a21e08981e18beaebefd839320f71c15b2839