Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c323bbb320e3b3a…

MALICIOUS

PDF

115.7 KB Created: 2021-07-01 19:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cc403d970380ad0571f7f91ac0bc9470 SHA-1: 49416bbc0302315c918d891057001086534cfcf9 SHA-256: 4c323bbb320e3b3afc5057445a9a68d9d8263b512881e86c08c2d40512a7adb2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

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://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/05d5b564e6bc3289871e38825675197d/jogamoradaro.pdf In PDF document text
    • http://al-bandak.com/userfiles/file/55395529628.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/guzamubukusoguxigaxewole.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zivowomibarimenuv.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160942d784c838---dosupagibinafenaf.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/4203737087.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/1f86407ab092e75729bc8fa87b292a1e/rulolixele.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a525640671e---wibelurixafiwuferik.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e471c80c5c---rumoditobizowuxa.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/79980381486.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/xizerejixatefogoluv.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210531_438600585B8D2919.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/zover.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/xukamoruvunidisa.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/acfdf2b206d12e18fd36164150e2cdd6/mimukel.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/rowogitovonajuwedatomo.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/73qrk0t49h96janp3gnbgu3915/33969908108.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1a5256415---78625072886.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d84644664a9---lesizomapulogasuwabiputi.pdfIn PDF document text
    • http://abpaluso.com/upload/file/8686118282.pdfIn PDF document text
    • https://arerp.kr/data/file///15429402406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pot+calling+the+kettle+black+idiomPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 20936 bytes
SHA-256: 9f30c57839697f7f7e8cb491d3f4657408034bf1be0b7138ed8b532c5cfc56b5
font_01_sfnt_off00012970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12970 35588 bytes
SHA-256: 4cac9334a976a0968c850f0514c2ff4e34468bb90aa05d711de35b53cf828172
font_02_sfnt_off00017d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D08 4816 bytes
SHA-256: 137fc740d2864ec9e0283dee67a21da5158f446b59d55597fb79198dcdcbb9ab
font_03_sfnt_off00018e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001a6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6A2 10780 bytes
SHA-256: f9e0b0b83dca81ddabc8f80dbb80bcbdf746590ff75dc65771c953fbd1eea485

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